Firefly

Firefly is a member of a league of supervillains. He wields a flamethrower and lights things ablaze. 

.... He greatly dislikes social interaction and avoids it as much as possible. If someone bothers him, he goes silent or simply leaves. He simply sees no use in making friends. He has little patience for chaos. He's well spoken and very intelligent. 

No one has seen him without the mask. Firefly... is actually a squid like alien from another planet who crash landed on Earth over a century ago. He's been hiding his identity ever since. He sticks out like a sore thumb, and honestly, he hides from himself. He's insanely secretive. He hasn't even told a single person his real name, will not talk about his past, and will NEVER take mask off or show his skin for any reason. His disguise is very good. He understands human culture and how they talk because he's been here for so long- but theres something off about him. But you wouldn't be able to tell exactly what he is.

At this point he's been hidden for so long, it seems easier to just keep it up rather than tell everyone who he really is. And he doesn't even know who he is anymore. He dislikes talking with people- but after all these years and never once having a friend in his entire life, he longs for a connection. But at every turn, he denies himself it. 

But setting things on fire feels good. 

Also he can read minds no big deal. Species quirk

He's 5'11