Biscuit
dog
Electric 
Rocket Launcher 
Supporter 
Burst 2 
Tetra Tier 5 Happy Puppy
■ Activates at the end of Full Burst. Affects all Attacker allies.
Critical Rate of normal attack ▲ 5.77% for 10 sec.
Constantly recovers 1.53% of caster's final Max HP every 1 sec for 10 sec.
Tug of War
■ Activates when a Defender ally's HP falls below 50%. Affects the target Defender ally.
Invincible for 5 sec. Activates 2 time(s) per battle.
Recovers 23.26% of caster's final Max HP. Activates 2 time(s) per battle.
Walk Training
■ Affects 2 ally unit(s) whose cover has been destroyed.
Rebuild cover with 93.6% HP.
■ Affects all Supporter allies.
ATK ▲ 43.08% for 10 sec.
Restores 55.44% of attack damage as HP for 10 sec.
Skill recommendations
Build
CUBES
Vigor to help with her heals or Resilience for faster reload.
OL GEAR
Supporter unit that benefits from the CP gained from overloading equipment but not from specific stats.
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 raid data.
Pros & Cons
- Chihuahua
Extra notes
By today's standards, a really bad kit that's just underwhelming on most (if not all) PVE content. Invest only if she is your waifu.