Delta: Ninja Thief
Water 
Machine Gun 
Defender 
Burst 2 
Elysion Tier 3 
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 7.09% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 8.88% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 4.74% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 7.64% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 9.57% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 5.1% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 8.18% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 10.25% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 5.47% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 8.73% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 10.93% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 5.83% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 9.27% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 11.62% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 6.2% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 9.82% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 12.3% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 6.56% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 10.37% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 12.98% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 6.93% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 10.91% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 13.67% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 7.29% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 11.46% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 14.35% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 7.66% for 10 sec.
■ Activates when entering Full Burst. Affects all enemies.
Ninjutsu Acid Bomb: Damage Taken ▲ 12% for 15 sec.
■ Activates when using Burst Skill. Affects self.
ATK ▲ 15.04% for 10 sec.
■ Activates when using Burst Skill. Affects enemies within attack range nearest to the crosshair.
Ninjutsu Hyper Acid Bomb: Damage Taken ▲ 8% for 10 sec.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 7.24% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 6.17% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 7.24% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 90.9% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 7.8% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 6.73% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 7.8% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 99.17% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 8.35% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 7.29% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 8.35% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 107.43% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 8.91% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 7.85% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 8.91% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 115.69% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 9.47% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 8.42% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 9.47% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 123.96% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 10.02% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 8.98% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 10.02% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 132.22% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 10.58% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 9.54% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 10.58% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 140.49% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 11.14% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 10.1% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 11.14% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 148.75% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 11.7% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 10.66% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 11.7% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 157.02% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
■ Activates at the start of battle.
Effects vary according to squad formation. Only one set of effects is applied.
Affects self if there are no other Defender allies in the squad.
Effect 1: Creates a Shield equal to 12.25% of the skill user's final Max HP for 10 sec.
Effect 2: Attract: Taunt all enemies continuously.
Affects self if there is another Defender ally in the squad.
Effect 1: Ninjutsu Camouflage: Prevents being targeted by single-target attacks for 10 sec. This effect is removed upon taking a direct hit.
Effect 2: Ninjutsu Injection: Recovers 11.22% of attack damage as HP continuously.
■ Activates when performing 200 normal attack(s). Affects self while in Attract status.
Creates a Shield equal to 12.25% of the skill user's final Max HP for 10 sec.
■ Affects self every 4 sec while in Ninjutsu Injection status.
Ninjutsu IFAK lasts for 4 sec.
Function: Stores up HP recovery for a time, after which all allies are healed for the stored amount.
Effect 1: The maximum amount stored is equal to 165.28% of the skill user's final ATK.
Effect 2: Once the duration ends, all allies are healed for the stored recovery amount.
Secret Technique: Ninja Overdrive
■ Affects all allies.
Distributed Damage ▲ 11.82% for 10 sec.
ATK ▲ 8.86% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 102.6% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 11.9% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 11.9% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 12.73% for 10 sec.
ATK ▲ 9.54% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 110.49% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 12.81% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 12.81% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 13.64% for 10 sec.
ATK ▲ 10.22% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 118.38% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 13.73% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 13.73% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 14.55% for 10 sec.
ATK ▲ 10.9% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 126.27% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 14.64% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 14.64% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 15.46% for 10 sec.
ATK ▲ 11.59% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 134.16% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 15.56% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 15.56% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 16.37% for 10 sec.
ATK ▲ 12.27% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 142.06% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 16.47% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 16.47% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 17.28% for 10 sec.
ATK ▲ 12.95% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 149.95% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 17.39% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 17.39% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 18.19% for 10 sec.
ATK ▲ 13.63% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 157.84% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 18.3% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 18.3% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 19.1% for 10 sec.
ATK ▲ 14.31% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 165.73% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 19.22% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 19.22% for 10 sec.
■ Affects all allies.
Distributed Damage ▲ 20% for 10 sec.
ATK ▲ 15% of the skill user's ATK for 10 sec.
■ Affects all enemies.
Deals 170% of final ATK as distributed damage.
■ Affects self while in Attract status.
Next shield's HP ▲ 20.13% for 10 sec.
■ Affects self while in Ninjutsu Injection status.
Maximum Accumulation of Ninjutsu IFAK ▲ 20.13% for 10 sec.
Skill recommendations
Build
CUBES
Like all machine guns; Bastion. Unless you are super unlucky with overload stats and get no max ammunition, in that case run Resilience.
OL GEAR
Most support units do not usually care about specific lines outside the CP padding for their buffs (caster's ATK when applicable) and increasing survibavility.
Simple support that doesn't have great personal damage, you can focus on max ammo capacity and anything else is filler.
Pros & Cons
- Great uptime on skill 1 damage taken debuff on ememies as long as you have good rotations (15 second duration)
- Pretty cheap character to build as a support on both skills and gear. You only care about max ammo capacity and any extra stats she can get, while her skills can be 7/7/4 for sustain and buffs
- Not counting the restrictions on her buffs to actually work, the numbers are actually pretty good. Consistent heals, damage taken debuff and some offensive buffs if you decide to burst with her
- Strong synergy on teams with Crown and Siren for great burst generation while still providing offensive buffs, shields, and consistent heals.
- If there are no Defenders on the team, her shields are not that great in contrast to her heals, losing a lot of value on those team compositions
- The 40 second cooldown kills a lot of possible teams to run since you are forced to run double burst 2 for her to just work, adding even more restrictions to team building with her
- At the moment of her release, if you want to pair her with Defenders to take advantage of her kit, the only real options are Cinderella and Crown, both which have already great setups and alternatives, making it really hard to justify pulling or building Delta
- Her taunt makes it pretty hard to keep her alive, regardless or shields or heals since it's continuous, making it almost mandatory you run her with another Defender on the team
Synergies & notes
If she's not paired with Crown (or overall Defender units, but not a lot of actual good picks outside Crown or Cinderella) it's not worth using her.
Her damage taken debuff is pretty good if paired with consistent heals (similar to Marciana storage, but based on her own damage), and even though her numbers are great, it's still quite niche with the current roster.
If not used on a team with another defender NIKKE, her rating would go down, considering her shields are way worse and she will taunt and, most likely, kill herself.
Solo Raid Usage
This is based on the top 50 players of all NIKKE servers combined. Data is from enikk.app, check their website for a lot more information.
Usage shown is based on the date the unit was released to avoid empty spaces on previous raids.