Harry:
He's the Avatar obviously
Ron:
He would either be a Earth bender or have no bending
Draco:
Fire bender, blue fire, electricity
Fred:
Fire bender
George:
Water bender
Neville:
Earth Bender
Tom:
Fire/ electricity bender
Cedric:
Water bender possibly a blood bender
Oliver:
Earth Bender
Seamus:
Water bender
Dean:
Fire bender