It has to be him. 

Quirks are not super powers, and from what I saw so far people tend to see them too much as this... Quirks are essentially all mutations of the body. The Quirks have to find their origin from within someone, and more often than not using a Quirk will tire you just as much as using any other parts of your body, like legs or arms. So this is the direction you have to take. 

My villain is Poisonous, but she has to maintain that poison in a way not yet disclosed. Some others are hurt when they use their Quirks or hurt themselves or get tired. So this is the way you have to take to develop a real MHA Quirk ! Hehe. 

Way I see it, maybe he uses his energy when he uses the Quirk, so he has to eat more than others. Or Drink, or something like that.