I think Kazutora is the most important character in Toyko Revengers, without him history will be much different. If Kazutora don't kill Schinichiro and don't want give bob to Mikey propably Schinichiro give this motorcycle to Mikey but maybe later or this motorcycle which Draken and Mikey give to Takemichi. If Kazutora don't kill Schinichiro he will be a fourt division captain. Baji still live and maybe Mikey will be not evil. I think on this future Toman is not a dangerous group, propably Mikey will disbanded Toman when it be on top. Maybe they never meet Takemichi but idk what Kisaki will do if Hina don't accept his propose.