Kristoff's had a dark past. He was abandoned by his parents hence that's why he went to the train alone, unknown to a destination. Unfortunately, Isabelle, the oblivious pup, made him into a mayor, not knowing his past at all. Seeing this as an opportunity, Kristoff started a totalitarian dominion over the town, pestering the villagers to buy his stuff, to fill their houses with insects and fish, and to smack them with nets and forcing them to fall into pitfall seeds. Kristoff still doesn't know why his parents send him letters, but wishes to curse at them, but he doesn't know their address anymore.
Kristoff does a very good job at being a mayor in his town though. He lays paths around the town and makes pretty public works projects, giving the town an impression of being a perfect town.
Kristoff does pretty up his town for a reason though, he wants his villagers to be sacrificial lambs. Lambs to be harvested to the void gods who called upon him long ago. Whenever a villager moves away from his town, Kristoff gets very eager.
Here's a scenario with Tank.
-THE DAY TANK'S IN BOXES, Kristoff visit's Tank's house.-
"Hey, I'm moving away, off to new adventures, like a marathon! Sorry if I couldn't set up a gym here."
Kristoff smiles at him, a very weak smile nonetheless.
The clock chimes at midnight, everyone's asleep, except Tank who has to get his staff packed up quickly. There's a knock on the door.
Tank opens the door.
"TIME TO DIE!"Kristoff shouts at him, causing Tank to flinch and giving Kristoff the opportunity to smack him with a net.
Tank wakes up, only seeing the ocean spreading on to the horizon beyond. He realizes he couldn't talk, he's mouth covered by duck tape.
"I summon thee, void gods, here is thy sacrifice, a meaty one." Kristoff says aloud into the ocean.
"I hear, I consume!" a booming voice shocked Tank.
Suddenly, darkness consumed the ocean,giving it a black color, forming a gigantic person about 100x tall than Kristoff.
"Him?" The creature asked.
"Yes." Kristoff replied.
Tank's last sight was the eyes of the void god, consuming him into the void.
This is supposed to be the lore of my cycling town
So Kristoff's very cruel, vindictive, power-hungry type of person.