Just your name is fine! Sometimes keeping it simple is best. Although, if your name's already taken, you might have to add some numbers or extra letters, like mine.

[She shows him her own username by pointing to the top of the screen: 'michiru_0513'. (Please ignore the follow-on messages from Shirou in her inbox reading 'are you okay' and 'please respond'.)]

To be honest, I just copied mine from my Facelook screenname back home, so it'd be easier to remember... [It's a little lazy, but that's how she rolls.]