We never alias single names to full names. That's a very old and sound policy, even if "Luffy" is unlikely to appear again anytime soon.
Posted under General
Well, it's 98% sound anyway, I have done some but it's rare. And almost exclusively for artists, and that mostly because people created very ambiguous artist names that became clashes later.
Luffy almost warrants an exception, actually, but since monkey_d_luffy is already in use and has been for some time, I don't think it needs one.