What kind of extra charge would you have for a complex character (Such as a zebra/zony?)

Yes (unless I am misunderstanding what your asking.) There is only one kind of auction on this site, so you have to create four separate auctions, a specific one for each slot.

Not sure if you actually can, but if so you may want to take the auction down and restart. I know a lot of people (myself included in this) don't normally read the comments, and therefore are gonna miss this.