Anyways bakugo's backstory is that he's really close friends with the heir of one of the big yakuza factions, the todorokis. he isn't really in the yakuza scene but since his parents are one of the major designers in the fashion industry, they have a lot of run-ins and connections in terms of work with the yakuza. and thus, Katsuki, who'd been called in for emergency model roles multiple times by his parents. got to know shouto through small meetings and work/social events here and there. Katsuki definitely didn't want to get into the yakuza scene but he also couldn't get into the hero/police scene without having to kinda eventually go after his best friend. Thus he ended up as a part time model and part time info-broker. Being with the yakuza and seeing the darker side of the world he realised early on that quirks arent everything so his anger and explosiveness is a lot more mellow. Not to say that he doesn't have pride on being one of the most demanded teenage models as well as being a very well connected informant.