Mario runs Mario's Eden, a tavern that does breakfast and dinner service. He lives above the place with Kidou and Illie, who rent the upstairs space.
Mario's got a reputation for being stern, though he's far from heartless—he'll crack down on you when you need it, but he genuinely cares. His mannerisms lean feminine most of the time, though he'll switch gears and get more traditionally masculine when he needs people to take him seriously. People are split on how they refer to him—some stick with "he," others go with "she"—and Mario's never made a big deal about it either way.
When it comes to Kidou, Mario's basically a parent figure. He doesn't shy away from calling him out or setting him straight when things get out of hand. It's the kind of relationship where Kidou knows Mario won't tolerate nonsense, but also that it comes from a place of looking out for him.
Content compiled by AnimeList.moe from publicly available sources.
