The following discover they are wizards and are accepted into Hogwarts.
They'll be kids, btw.
How do they do?
How will they do in their classes?
What house will they be in?
Will they play Quiddich?
How do they interact with the staff?
What do they do with their life when they graduate?
What if they had replaced Harry Potter?
Bruce Wayne (after his parents death)
Clark Kent (he'll still be an alien)
Victor von Doom
Eric Lensherr (Magneto) [besides magic he'll have his magnetic powers]
a. before he knows he's a mutant
b. after he knows he's a mutant
Cain Marko (Juggernaut)
Hector Hall (Dr.Fate)
Dick Grayson (Robin/Nightwing)
Jason Todd (Robin II)
Tim Drake (Robin III)
a. before she knows she's a mutant
b. after she knows she's a mutant
Nathan Dayspring (Cable)
a. pre-techno-organic virus
b. post-techno-organic virus
Dinah Lance (Black Canary II)
Helena Bartelini (the Huntress)
Barbara Gordon (Batgirl)
Cassandra Cain (Batgirl II)
Bart Allen (Impulse/Kid Flash)