I had whole pages of characters I drew as a kid. The Rock-Eating Fish was one of the most lasting.
More recently there have been faces such as Kid Kraken and Jacques the Spider.
I have others from various stories I've been working on. Also on my former Sporeum forum, one of the long-running threads essentially turned into a great big role-play as a result of my weirdness, in which eventually we learned the true face of BulletMagnet, seen here with his clone protege.
