It's amazing what turns up on the web....

I was idly googling the names of our family members when this turned up on the first page...
slashdot who needs the way-back-machine when you have friends (I question this after seeing some of the photos newt posted of C) with far too much bandwidth.

C's Alter Ego is a British actor who has appeared in Blackadder and a number of other TV shows. Apparently he has also written at least one stage play.

If you add firewall or VPN to C's search criteria it narrows down nicely:-)

K's Alter Ego is a rather mediocre artist also English...

S and A don't currently have eponymous Alter Egos though there are some interesting links between people who have one or other of their names...