WIzardman

The other Arbcomm member who has refused to identify himself is Wizardman. As it turns out, Wikipedia Review user Proabivouac already discovered his identity, and posted it on Don Murphy's blog. Name is Daniel Tylicki.

http://www.donmurphy.net/board/showthread.php?t=31344

http://www.wikipedia-watch.org/cgi-bin/girc.cgi?Na=Wizardman

http://www.classmates.com/directory/public/memberprofile/list.htm?regId=7491681163

He is a regular contributor to Armchair GM, a Wikia sports site. This fits with his extensive edits to Wikipedia articles about American sports stars, mostly concentrating on baseball.
http://armchairgm.wikia.com/index.php?title=User:Wizardman

Dan Tylicki is presently a student at Baldwin-Wallace College in Berea, Ohio. It is a small liberal-arts college affiliated with the Methodist Church. His father, Parma insurance agent Gary Tylicki is an alumnus. Another relative, Robert Tylicki, has bequeathed money to the college.

http://www.bw.edu/academics/

Obviously Wikipedia believes that anyone can become an arbitrator, regardless of their youth and inexperience.

Who is Carcharoth?

Most of the current Arbitration Committee has self-identified on Wikipedia, either currently on the official page, or previously on a talk page or another WP official page.
http://en.wikipedia.org/wiki/Wikipedia:Arbitration_Committee

One notable exception: Carcharoth. He was a popular choice for admin and was elected to Arbcomm, although some of the more destructive and hostile elements of admin ranks opposed his Arbcomm election for irrational reasons.
http://en.wikipedia.org/wiki/Wikipedia:Requests_for_adminship/Carcharoth
http://en.wikipedia.org/wiki/Wikipedia:Arbitration_Committee_Elections_December_2008/Vote/Carcharoth

Reading Wikichecker and his contributions reveals that he is likely to be in the UK, and has a consuming obsession with two things: Tolkein (not surprising, as his name "Carcharoth" is that of a monster in a Tolkein book), and chess.

A very nerdy fellow. Since he has probably participated in discussions on Tolkein forums and Usenet groups, a search of Usenet activity for combinations of "Wikipedia", "Carcharoth", "Tolkein" and "chess" keeps leading to a single name: Christopher Kreutzer.
http://groups.google.com/group/alt.fan.tolkien/browse_thread/thread/563a7be5e8c6e21/20728993fde98554?q=chess++tolkein+carcharoth#20728993fde98554
http://groups.google.com/groups/profile?enc_user=_g-axRkAAABwB4HlNHhIdD83P2GVa-8fQew15lnDCygdGNfT0wc1ZA

He is an officer of the Tolkein Society in London.
http://www.tolkiensociety.org/2005/committee.php?cm=ChristopherKreuzer

And captain of the London Deaf Chess Club.
http://deaf-chess.de/downloads/20080930_RE-Bericht_GL-WM.pdf
http://www.londondeafchessclub.com/playerprofile.asp?pid=9