Tactical
Gray uses "Fierytooth" to attack, dealing damage equal to 111.3% ATK to a single enemy with a 35% chance to Taunt them for 1 turn.
DMG is increased by 5%
Effect chance increased by 5%
DMG is increased by 5%
Effect chance increased by 10%
DMG is increased by 15%
5 Deal damage equal to 167% ATK to a single enemy with a 80% chance to inflict Infirmity for 2 turns.
Deal damage equal to 167% ATK to a single enemy with a 80% chance to inflict Infirmity for 2 turns, reducing their Action bar by 30%.
DMG is increased by 5%
Effect chance increased by 10%
Reduces cooldown by 1 turn
Effect chance increased by 10%
DMG is increased by 15%
4 Deal damage equal to 74.2% ATK to all enemies with a 50% chance to inflict ATK Reduction for 2 turns.
DMG is increased by 10%
Effect chance increased by 10%
Reduces cooldown by 1 turn
Effect chance increased by 15%
DMG is increased by 20%
Primary Decoder Chip x27 
Gold x51660 Can apply anti-heal on skill 2
Can taunt on skill 1
Skill 3 is an AoE attack with attack down debuff
Low base speed
Taunt doesn't work on bosses
Attack down chance max skilled is only 75% chance
Gray (ArdeaCinera) is a 3 stars Tactical character in Artery Gear.
Gray is actually a decent budget debuffer that you can use against tough bosses. Due to her being able to apply attack down on skill 3 and also anti-heal (infirmity) on skill 2, she can deal with Iron Maiden pretty well.
If you need to clear Iron Maiden 7/8/9, she can be part of the team alongside Roko, Morris and a flexible unit (Komachi is pretty good healer/buffer here). Although the success rate of the runs might not be 100%, but it allows you to get first clear, which is vital in trying to get the rookie mission rewards.
She can also be used against Octopus as well for the attack down so your units can survive better against the boss and the minion counter attacks.
Outside of that, she doesn't excel in PvP much and is strictly a budget PvE unit.
Here is a video of Gray helping out in Iron Maiden:
