The first thing I thought was Gimpor! Sorry!
Seriously though, I think he sounds too dark for MOTU (what I consider MOTU, anyway). Being called Man-A-Kil sounds cool and having him be the head honcho of Beast Island's prison would be enough for me. He would have plenty of encounters with escaping Rebels!
I can see him watching that big screen thing while Bow, trying to escape, runs down hallways, evades traps and snots Troopers and when enough is enough Man-A-Kil steps in, kicks Bow's butt and drags his sorry carcass back down into the bowels of the prison. Awesome
Nothing much like what you said but thats what your cool drawing brings to my mind
The next time Bow tries to escape, just hearing those chains scraping along the dungeon floor is enough to send him scurring back to his cell!!!