Knowing the edition is the key thing. If you're intending on playing 3.5 edition, then you wouldn't touch a pixie to play a wizard, because of this thing called level adjustment. In an official D&D game, you wouldn't be a level 6 wizard pixie, you would actually be a level 2 wizard -- to make up for the massive advantages a pixie gets at the front end of its progression, it gets nerfed by four levels compared with everyone else. This is Bad, as in BAAAAD, because 3.5 edition prioritises magic over all other forms of pwnage. Literally the less magic you cast, the less powerful your character is. You are basically giving up four levels of spell for some bonuses to DEX, INT, WIS, and CHA. Oddly, this probably makes the pixie a decent martial character -- Paladins benefit from at least three of these attributes, and their casting is pretty crap, so it doesn't matter. Much of what I'm saying might be a bit moot since I have a funny feeling you're playing fourth edition rather than third, but in passing, a handbook for building pixie characters is here. Ramza's advise is good. Basically, as far as you can you shouldn't be a one-trick pony in D&D. Your riff will eventually get built against by a smart DM. Best way to avoid this is to be a caster and level up as a caster as quick as possible, because your options increase at a geometric rate. By the way, welcome to the RPF!