Harry potter-CHERUB

Harry potter was found on the door step of 4 little whinging the night of his parents death by a CHERUB agent. Harry potter was then looked after by a foster family in the CHERUB HQ. When he is found out to be a wizard he has his name put down to join the magical espionage group.

Not yaoi

Heir to Potter family (and Black as well as Peverell if you want to)

There must already be wizards there working in the wizard section of the campus

He's a grey wizard (uses both dark and light magic)

Doesn't go to Gryffindor either Slytherin or Ravenclaw