Some of these anagrams were done “manually,” while some were done using the Internet Anagram Server.

Harry Potter

HOT TAR PERRY
TERRY HARPO
HE TRY PARROT
HYPER TAROT

Albus Dumbledore

A DUMBBELL ROUSED
A BUMBLED OLDER US
A BUMBLED OLD RUSE
A BUMBLED OLD USER
A BOBSLED MUD RULE
A ROBBED DULL MUSE

Tom Marvollo riddle

I AM OLD TREVOR MOLD

Neville Longbottom

BE LIVELONG MOLT NOT
BE LIVELONG MOLT TON