I think short word names that are 4 to 5 letters are the best. Such as larm and neko above. They just sound cool and are neat without numbers. No need for short form. They don't even have to have a meaning to the user.
[7:19 PM] Aliosa: Can't have loopholes if there are no loops.
[9:14 AM] Viddah: Just remember if you step on toes youre gonna have to suck on them to make the pain go away
[9:16 AM] [Faux_fan]ancient: put me in the screenshot