I don't have any awesome ideas off the top of my head, but I want AU CR with Strawhats because Kamui canonically references OP and wants to be king of the (space) pirates.
Kamui is great with anger because he doesn't give a shit and thinks pissing people off is not only funny but endearing. He's 19 (technically still a teenager!!1!), was dumped in a juvenile detention facility for a year after assaulting a fellow student as a young teen, and still runs in fighting circles because rage should not be repressed. Could be the hypocrite who just barely manages not to get arrested on a daily basis but has the balls to tell Sanji he needs to stop smoking because it's bad for him.
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Kamui is great with anger because he doesn't give a shit and thinks pissing people off is not only funny but endearing. He's 19 (technically still a teenager!!1!), was dumped in a juvenile detention facility for a year after assaulting a fellow student as a young teen, and still runs in fighting circles because rage should not be repressed. Could be the hypocrite who just barely manages not to get arrested on a daily basis but has the balls to tell Sanji he needs to stop smoking because it's bad for him.