These are in the TOS
In particular, you may not use any name:
That utilizes "Leet" or "Dudespeak" (e.g., "Roflcopter", "xxnewbxx", "Roxxoryou")
Comprised of gibberish (e.g., "Asdfasdf", "Jjxccm", "Hvlldrm");
Comprised of partial or complete sentence (e.g., "Inyourface", "Welovebeef", etc);
That incorporates titles. For purposes of this subsection, "titles" shall include without limitation 'rank' titles (e.g. , "CorporalTed," or "GeneralVlad"), monarchistic or fantasy titles (e.g., "KingMike", "LordSanchez"), and religious titles (e.g., "ThePope," or "Reverend Al").