persona
character assumed by a writer or a performance artist
avatar
graphical representation of the user or the user's alter ego or character
Defuser
persona
The Thin White Duke
David Bowie character
Halloween Jack
persona created by David Bowie
P. D. Q. Bach
fictitious composer invented by musical satirist Peter Schickele
Suicide
professional wrestling gimmick
heteronym
imaginary character created by a writer to write in different styles