There's no way (as far as I know) to do it currently, and I don't see the admins coding it into the site in the near future. Sorry. As well, it would cause much confusion if users were changing their usernames all the time.
1st you dont have to many points you could get them back in like 1 day
2nd why do you care its not like you changed your real name or anythin
3rd if firetail_madness changed his name think what would happen Ex:Omg gossip queens of AG someone took the place of firetail_madness and his account doesn't even exsist anymore. Omg! No it wouldn't work
although it would be original It would be bad for the site bad idea sherlock.
Yes. ProfessorOak is famous because he's the first person allowed to have his name changed on AG. If it can happen, so can others. Your reasons have to be convincing though.
Mate, you got a whole legacy as Holt here, why confuse and throw bits of fame away, just for some name changes.
If mods would change names, they would be flooded by requests, and I'd rather see them working on the spammers and trolls, rather than name changes.
If we would be allowed ourselves, then things might turn rather confusing. It could be allowed to change display name (which keeps your username the same, which is your login and your profile name, but your nickname will be displayed as the display name in the forums etc).
I'd prefer no name changes though, or only for regulars, before it turns too confusing.