I picked Azrael from Blazblue, which is pretty much my favorite fighting game series in the history of fighting games.
Azrael, The Tyrant
Passive - The Terror
Azrael's abilities reveal Weakpoints on hit(Upper and Lower), which can be consumed by subsequent ability uses to deal increased damage and gain additional effects. All Weakpoints will expire from a target after 10 seconds. Applying or consuming a Weakpoint resets this timer.
Additionally, Azrael's basic attacks against targets with at least one Weakpoint reduce his ability cooldowns by 1 second.
Q - Gustav Buster
Azrael throws a wild haymaker punch that deals moderate damage to an arc in front of him and applies an upper Weakpoint.
If Gustav Buster damages an enemy with an upper Weakpoint, that Weakpoint is consumed and Gustav Buster deals 35% additional damage.
W - Sentinel Dump
Azrael jumps to a target location, slamming the ground and knocking up nearby enemies for .5s. Sentinel Dump applies a lower Weakpoint. If the target already had a Lower Weakpoint, that Weakpoint is consumed and the target is stunned for 1.25s instead of knocked up.
E - Growler Field
Azrael summons a red aura that surrounds him for .75 seconds. During this time, Azrael cannot move or attack, but will absorb projectiles. Absorbing a projectile in this manner replaces Growler Field with Phalanx Cannon for 5 seconds.
E2 - Phalanx Cannon
Azrael throws a fast moving projectile that deals moderate damage to the first target it encounters and applies a lower Weakpoint. If the target already had a lower Weakpoint, the Weakpoint is consumed and the target is slowed for 3s.
R - Black Hawk Stinger
Azrael channels for 1s, then quickly charges a target champion and delivers a powerful blow that deals moderate damage and knocks them back slightly. If the target moves out of range at any time, the ability will be cancelled and half of Black Hawk Stinger's cooldown will be refunded.
When cast against an enemy with one revealed Weakpoint, Black Hawk Stinger's damage is increased by 15%. If the enemy has both Weakpoints, Black Hawk Stinger's damage type additionally becomes True. All Weakpoints on the target are consumed after damage is dealt.