Hi, Gay! (let's just assume that this is your name)
But damn! This thread sure is active....
Lemme join! I usually use 斎木 才和 (read as Saiki Saiwa) for my nick name whenever a game requires both sure and given name.
But if not, then I will use "Adhen", it makes me feel at ease since this is abbreviation of my real name. The idea came from Kirigaya Kazuto being Kirito (damn that guy! genius!)
If you ever see a player in a game (mostly Japanese online game) using "Adhen" as a name and not アッデン, that's probably me
*Just FYI, 斎木 is a family name (no meaning) and 才和 is formed with 才 (talent) and 和 (harmony), so you get the picture of the name there.