There isn't one single username I use anywhere, but here are some of the usernames I do use.
*Lastrador on Alter Aeon
*Rayman on Materia magica
*Regentron / Ferrumite on the forgotten islands
*Ranjeni orao on crazy party
*Ferrumite on playroom, RS Games, and so on.
*Nocplusten on undead assault, all servers
*Regnum on erion
Please note that I might forget to update this post, so don't be surprised if you see someone with a username not mentioned here claim to be me. It's most likely me.