Bard of the electric bass - You run around with an electric bass and play kick-ass rock riffs that affect everyone who hears it. Play Ironman for +999 armor, In-A-Gadda-Da-Vida for ... uh ... something, Dazed and Confused for mass confusion, Another One Bites The Dust to make someone at random drop to 1 hp, etc.
A plaything of Xom - Based on the DCSS god of chaos Xom (see
http://crawl.chaosforge.org/Xom). Everything is random. Your starting character, the world gen algorithms, the creatures, the magic system, the items, even the graphics and colors. Everything. Xom randomly changes things up too.
Kobold explorer - You play a lowly kobold with poor stats trying to turn more powerful factions against each other so you can explore your neighborhood.
How I play roguelikes - You are guaranteed to die within 5d20 turns.