http://www.theyeshivaworld.com/coffeeroom/topic/do-you-have-a-picture-in-your-mind/page/3
http://www.theyeshivaworld.com/coffeeroom/topic/if-you-could-choose%E2%80%A6
oomis = Mrs. Weasley
ZeesKite = Snape
writersoul = Hermoine
moskidoodle = George Weasley
more_2 = Mrs. Dursley
HaLeiVi = Sirius
HaKatan = Flitwick
Shticky Guy = Harry Potter
Baal Habooze = Mundungus
bar shattya = Weasley’s ghoul
Goq = chocolate frog
yitayningwut = Voldemort
Luna Lovegood = Luna Lovegood
cinderella = Harry before his 11th birthday
Syag Lchochma = Crookshanks
Here are some I would suggest:
squeak = Scabbers
superme = Dennis Creevey with superpowers
Curiosity = a centaur (since he seems to share their preoccupation with Mars)
aries = Amelia Bones
DaasYochid = Kingsley Shacklebolt
mod-42 = Xenophilius Lovegood
Also, I personally think popa is more of a Peeves…what do you think?