char: resident evil.
tldr my ideas here are very "wesker and ada adjacent but not quite"
char's father had ideas around newtypes that were later co-opted by umbrella for initial research & use in bioweapon development before he was assassinated, making umbrella the zabi proxy in this universe & therefore the group char wants revenge against. so char infiltrates them as a tactical strategist for their private security branch maybe? he can work with wesker & the birkins around this time or something idk. but his whole goal is to blow up umbrella. he does not do that because raccoon city and the mansion happens first.
after raccoon city char fakes her death and then joins the BSAA as lieutenant quattro but effectively is just kind of always serving herself in one way or another in terms of trying to stop BOW development. the hyaku shiki can just be the name of quattro's cool bike. with lots of guns on it. obviously. whether your character would recognize char from his time at umbrella is up to you/whatever makes sense. this is probably where most threads would take place i imagine
for those who care about gundam lore there could be a fun side-element here too of "cyber-newtypes" effectively being the artificial/virus strain for further weaponizing newtypes into BOWs which char would have a special disdain for but that's also easily ignored in favor of just focusing on traditional RE virus strains













