I'm just going to do profile for all 4 of the characters you guys will be "fighting" from Squadron Ichi so you guys have better understanding.
Sentinel:

Weapon: Twin pistol that she keeps on her shinguard.
Known as "Pint-sized Destroyer", Sentinel uses her expertise with twin pistols and agility to stupefy her opponents. While in battle, she shows extremely serious side as she dispatches her foes without mercy. However, when she is not in combat, Sentinel is just another little shy girl.
Her DPS is amazing, so without a way to properly guard her attacks, anyone who fights her wouldn't be able to even develop a hit to her.
Sentinel, however, does have her weakness: defense. Since she mostly relies on agility and evasion, her overall defense is very low. A strike to the head that would normally leave a bruise on a normal Character will leave her a concussion.