First up, Scout
Runner Up
Secondary item
Alt fire to charge
Charging regens HP up to 25% of base from current(basically 50 HP scout goes to 81 HP scout overtime like 3 HP per 2 seconds)
Double jump is usable while charging
Hitting targets while airborne(by any means, batarang, milk whatever) will mini crit
Full control over charge
+10% damage vulnerability
Minicritted while airborne