Here's what I did with my Pixie ... started out as a Wizard, went until she had all the 6 levels in stone, then jumped to Warlock, finished the seventh level spells up in the first three levels, then spent the next couple of levels getting more Fiend then Moon magic spells, now she's a Ninja and she is almost out of moon spells to learn, so I was thinking about making her A paladin yet and getting her the Crusade trait for later.
Hehe, did I mention her Name was Pixie? And her current weapon is a two handed sword ... named Giantsbane.
Would never happen in DnD, but it is fun to see.
BK