One of my favorite comic book runs in recent years was Geoff Johns' Green Lantern. If nothing else, there was incredible universe-building and a myriad of new characters, including Larfleeze. Larfleeze is-for a lack of a better term-a powerful, greedy alien bastard. That is really his whole schtick, but it is one that is really funny.
I used a G2 pen and a .01 and .03 cm Staedtler art pen for Larfleeze. For the black backgrounds, I used a fat tip Sharpie marker.