So I'm just putting nicknames for characters I like :)

Rapunzel

Punzie, punzel, raps

Varian

Var, Vari, V, Moon boy, alchemist, genius

Cassandra

Cass, Cassie, Cass-not-Cassie, CassAndra, moonie

Zahn Tiri

Tiri, Gremlin, Evil Demon-thing

Draco Malfoy

Drake, Drakey, Ferret boy, Ferret

Hermione

Mione, Smarty

Luna

Genius, Lune

Ron

Ronnie

Vania

Vani

Harumi

Rumi

Lloyd

Lloydie, green bean

Ninjalinos

Ninjis, the canon names

Odysseus

Ody

Penelope

Pen, Penny

Telemachus

Telly, Tele, Teleportation, Telemarket, Telemarketing, all those names, little wolf, pup