aaaaaanywho- want me to start?
......WAIT NO THAT-, NO NO NO. HE NO MAKE PEOPLE TELL TRUTH- 0-0
... Actually lemme go into detail with his quirk. Now i kinda wanna do it-
Quirk: Mind.
As suspected, his quirk is not only high-intelligence in itself, but the ability to make others do to his will, no matter how strong they are. Unless they are someone of the magnitude of AllMight, he is able to make others do what he wants. Not only that, but he is also able to see the memories, or go as far back into their mind as he wants. But he does have a limit, he can only control about 2 people at once, and even then if he controls them both for more than 2 hours, he'll collapse entirely. In a sense that is, his mind does. After that point he becomes weak, unable to conquer much up anything else other than perhaps the mindset of someone like Momo, or uraraka. Even then it may not sound bad, but it's what else happens.
Ok here's my idea:
Emotional Manipulation.
Rather than having direct control over a person's actions, he has control over a person's emotions. Basically, by having them engage with him in anyway-easiest way is asking a question and having them answer it- he can gradually magnify or warp a person's emotions to affect their fighting style, maybe even causing them to turn against their opponent. It takes as little as a 1-word interactions to have the control begin. The more they interact with him, the stronger his control becomes. However, heightening someone else's emotional energy exhausts his own, making him feel both physically and mentally drained. The more people he controls or the greater the emotion he's controlling, the more drained he gets.