The original badass, Garland, who eventually became a god! And him as a the God of Discord and Chaos:
Nah, he isnt that crazy, but if you want really crazy people... How about Hallelujah Haptism? Or Albedo? He was crazy enough to tear his own head off then crush it with his foot! This^ Is epic win
I only have two Spoiler This guy become a badass in one day (got to admit it) Spoiler C'mon don't tell me that isn't obvious