It's Theodore Fourofourski with Good Old Games' old colours in the background.
I took him from this page and made him look a bit sceptical. Originally, he was part of a little teaser comic for a special giveaway (
page 1,
page 2,
giveaway title). Later I took him as an avatar, because I was quite uncertain where GOG's new path would lead us (back then, in the glorious days of
Good News™ and the Letter from the M.D.).
I still have him as my avatar because I don't change my avatar very often (I'm just too lazy to look for a new one). And there are still reasons to be sceptical (state of the forum, the dead movie section, still missing a lot of semi-new blockbuster games and especially the problem with very late or missing patches).