1. You'd have to request it to an admin and the most likely answer would be no. (If you're arguing for permanent size increases for everyone) If you just want a larger avatar normally then you can buy a subscription.
2. I forget if it's possible to have a ' and such things from normal registration. If it is possible, a simple name change will get you there. If it's not possible with normal registration then you're either shit out of luck or it will cost you a lot of tc. (That's on the assumption that it is even possible to have a ' and that it won't break stuff in a weird way. Probably won't but you never know.)