"Gimmie yo diploma or ah'll make ya break yo face."
Ahem. Sorry.
Anyway, I have two different character ideas for those powers.
The Warlock-y one would be a girl. A very scary girl.
"You do know I can throw fireballs, Right?" "Ah, the screams of the utterly terrified. What a wonderful way to start my day."
The Avatar person would be a sort of shy, socially inept person who uses the avatar as an alter ego.
"I can sort of fly, Which is awesome. And sort of make things with my mind, which is also awesome."
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather