Good idea, it has been requested a lot tho, I don't think if we're going to have hats and stuff, but color changing and changing the alphabet on b bots front should definitely be added.
BUT if you change b's alphabet you will change his name example i change his alphabet to A his name will be "A bot"
adding onto this, if the bots had usernames it would be cool of the first letter of that name be the letter written on the bot