i haven't seen many, but if there are any of these i think they're cool:
hold still. XD
Pockycrazed, mine=Fayblack, Blackstar, PolyjuiceBrewer
head-heart-HP, olympian hero, polyjuicebrewer
I love all the user names, but i like JustSimplyMe,IceCreamAndSprinkles, zeusgirlrulestheworld, and mine! (Olympian_Hero) I love all of those people's nicknames too!!!!! Yupp_ , Head_Heart_HP , Juliet_Gray
nice! i love all of them! i kinda like mine. Call_Me911... i do LOVE them all!
Um.... Dang this is hard....
I'm with PolyjuiceBrewer for the Harry Potter part, but choosing one is like asking me to willingly lose a limb.
So, I have to say, that while I love all the username/nicknames that my friends have chosen, my favorites have got to be Loony_Luna_Lovegood/ravenclaw4ever and Gwiazdy/CharmingPotion
Well, anything to do with Harry Potter is awesome to me. But if I had to choose one...
Either Harry_Freakin_Potter2397 or Loony_Luna_Lovegood/ravenclaw4ever
Um Well everyone has an awesome name!! I like yours but my favorite would have to be .... Erg!!! This is to hard to close but I like ice-creamandsprinkles on, head-heart-HP xD