Bad Fuckin' generally acts lazy and childish in Fantendno because he's the fucking Mayor you can't tell the fucking Kaiser to be mature. However during his travels in the Fantendoverse he attempts to look like a cool-headed hero of the universe and generally fails spectacularly. Though occasionally he manages to do important stuff either by accident or by luck and thus exists in this sort of equilibrium where he's too much of a dipshit for any villains to go hunting after him but he's occasionally useful enough that most heroes can atleast tolerate him.
How Bad Fuckin' came into existence is a mystery just like his homeland's origins. Some theorize that the gods made Fantendno on a drunken bet and after realizing what the fuck they just did panicked and created Bad Fuckin to keep the land stable and generally watch over it because dimensions when left unchecked can churn out some crazy shit. Out of boredom and curiosity the gods created corrupted clones and put them into Fantendno to see how they would react to Bad Fuckin. After some intense duels Bad Fuckin' reigned supreme as Chieftan of the entire Fantendno nation of about 4 people.