There's a few lists running around of various Bibliobloggers' alter-egos. I have had the illustrious honor of being on a few. Here are my alter-egos according to fellow Bibliobloggers.
On Chris Tilling's site I am "Pope Benedikt XVI". My favorite two on this list are Jim West as Paris Hilton and Stephen Carlson as Britney Spears. Those are spot-on.
On Jim West's site I am Pope Pius XII (a very Holy man indeed!).
Apparently an ultimate correction was needed, so on Michael Barber's site I am John Henry Newman.
No offense to Mr./Ms. Spears and Mr./Ms. Hilton, but I think I really won out on all three.