Counter on massive amounts of roids.
Basically, if she's not at full health, the enemy gets the damage they do to her, done to them, AND it reduces their skill and speed by 3.
Gotta say, this girls on fire when it comes to online potential. Her personal skill is gonna make her a mainstay for teams, I'm sure of it.
For her character though, I really love her. She's very dedicated and quite endearing. Her initial reaction in the S-support scene until Kamui clarifies the intent to marry her, is hilarious. I'll likely marry her in one of my playthroughs.