Well as you know, you cannot create a character with name of a mob,raid boss or NPC. For example when you try to create a character with the name "Zaken" the game won't create it. For that reason I am gonna show how to do it.
1st step: Open L2Net
2nd step: Choose OOG and then put the server's IP, your account name and password and login to the server.
http://i55.tinypic.com/25jv38h.jpg[/img]
3rd step: Choose create new char and enter the name you want (mob,rb or NPC)
http://i52.tinypic.com/2ypgiuu.jpg[/img]
That's it ;) Now you can play with the name that you couldn't create from the game.
Have fun.
http://i51.tinypic.com/6dwuop.jpg[/img]
It is tested only on Freya but I think it works at every client.
Credits: Me