I see a couple people talking about Tortall characters- that would be awesome! I think I'd pick Kel if I was going to do that, but honestly, picking a character from Tamora Piece, I'd probably take Tris from the "Circle of Magic" books. Or maybe not; I may be getting a bit too old for a character that young. lol!
I've always wanted to make a costume of Merry (from LotR) in his Rohirrim armor, but that would be so incredibly hard to do. Maybe if my husband ever learns to work leather, like he's been talking about learning someday... And I'd love to make an Eowyn costume, too.
I have a costume of Susan from Discworld that I made for a book signing/Halloween, but I haven't done anything with it in probably four years. I really should get a wig for that someday and actually wear the darn thing again. And find my husband's Rincewind costume, for that matter. I've always kind of wanted a costume of one of the girls from Monstrous Regiment, but probably not enough to actually *make* the costume. Heh.
I have a costume that's technically a Herald of Valdemar (by Mercedes Lackey) cosplay. That one's entirely finished, but I've kind of fallen out of liking that series so the only time I've worn it was for my wedding and that was without most of the accessories that made it a cosplay (I originally bought it to be a wedding dress, then made the bits that made it a costume figuring I could use the dress for both). Sheesh, what is it with me starting costumes and then abandoning them? lol!
I also joke with my husband that I'd love to make a Caliban costume since he's my favorite Shakespeare character, but that's more joke than anything else.