Part 2 of a 2-portrait commission I got from https://www.furaffinity.net/user/akidaswolf, of two of the characters I run for a friend's DnD campaign. Our DM has grafted in a few different sets of rules, so it's not all perfectly canon. =P
Sleekit Twitch-whisker is a Skaven (rat-man) of Clan Skyrer, and as such is a student of the technological arts. However, somewhere along the line, his mind began to snap, as he became more and more fervently devoted to his machines. It may have been when he managed to split his own personality (ala Jeckyl & Hyde), or perhaps it was one too many failures of his warp-lightning cannon. Nobody is really sure, because Sleekit left in a flurry of papers, chittering something about "going to destroy the world."
At the moment, he is a lucid, functioning Mad Scientist, with just enough focus to zing from one project or search to the next. The only constant about him is that he's an insanely crack-shot with his Warplock Jezzail. Perhaps the only project he's ever truly finished was total cybernetic replacement of his own arm, which he lost in a tragic gnoll accident (an ooops on my part =P). Eventually, however, upon amassing enough components, he will snap yet again, and focus in on re-creating the legendary Doom Hemisphere, upon which point, the world will be in serious, rat-induced jeopardy.