I'm not too picky about the breed, but would probably end up being a quarter horse since I would want to work on a cattle ranch. Lot's of fresh air, exercise and space. I would prefer to be a gelding, because they seem to have less drama in their lives than most of the mares I know.
Not sure which breed I should be, but I'd like to be a thoroughbred. They seem to be more independent and expressive. I would be a mare for sure, though. I have my own opinion on things, I don't take any guff from anyone, and when I get mad, I can be kind of scary! :p
I think if you took me physical and mental characteristics they would most reflect an Icelandic Horse. I'm short, my ancestors are mostly Scandinavian, and I have an amazing ability to speed walk way fast than other people. I've always wanted to race but it looks really silly so I don't.
I would be a grumpy mare on heat who refuses to be caught, bites when having the girth done up and kicks when someone gets in my way. I would also buck when asked to go faster than a walk and run under trees to try and get my rider off. Thank god I'm not a horse.