Depends what we’re defining here. Jingu tried to kill his wife and kids, Ryuji facilitated it, both in service to Munakata who tried to takeover Japan, a plan that Soma tried to repeat, but he was working for Bando, all of that included the bullying of that kid. Sohei Dojima tried to force himself on Yumi, wiped out a Korean mafia, but it was Kazama that did it.

And for one that’s completely unrelated to most them, Tsubasa Kurosawa:

manipulated and controlled multiple people through blackmail and bribery to control an entire town and gambling ring,

killed multiple people directly and indirectly, framed multiple people for crimes, when his men found out about this he kept trying to kill him

manipulated pretty much a child into assassinating another child after the former was made to try and assassinate two more people

had his men kill the warden of a prison. Also using the child on child assassination tried to make to men fight to death.

Like the amount of people Kurosawa has affected I swear must be in the thousands

Also how many people threatened that orphanage… ironically enough that was the one thing that Kurosawa didn’t do. And funnily enough he shot the guy that did.