Energy Suck

Vitality Stealing is the Quirk used by Rikiya Katsukame.

Description
By making physical contact and then inhaling, Rikiya can absorb the vitality of others, not only giving himself more stamina, but also gaining an increase in size and strength.

Weaknesses
If Rikiya is unable to make physical contact with his targets, then this Quirk is rendered ineffective. It is only when he is under the Quirk-enhancing effects of the Trigger drug, can Rikiya eliminate this weakness, as his power is augmented to where he can absorb the vitality of others through inhalation alone.

Usage
This Quirk has the advantage of strengthening Rikiya while simultaneously weakening his foes. Under the effect of Trigger, Rikiya can absorb the vitality of nearby people by only inhaling, no longer requiring contact. In the latter case, the Quirk activated entirely on it's own while he was unconscious as soon as the drug took effect, waking him up and replenishing his stamina. This allowed him to fight evenly against Ryuko Tatsuma, the No. 10 Pro Hero (formerly No. 9), Nejire Hado, one of The Big 3 of U.A. High School, several other Pro Heroes, policemen, and interns for 20 minutes.

It was only when the effects of the drug wore off that the weakened heroes from Ryuko's office were able to defeat him with a combined attack. By contrast, before he took the drug, Rikiya had been quickly subdued by Ryuko alone.

Trivia

 * Rikiya's Quirk seems to be heavily based on the powers of Superman villain, who could also absorb the strength and energy of others through touch in order to add to his own temporarily.
 * It could also have been inspired by Ban's magic from The Seven Deadly Sins, which allows him to steal weaponry, strength, and organs.

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Vitality Stealing