Takamaru getting aroused around women, being a reference to Captain Rainbow, would be adorable and hilarious... it'll just have to be more subtly without any visible nosebleeds. Although I'm not expecting the reference, I do really like sleeve cover idea. I don't think they have to go specifically with the nosebleeds, as long as there's the general idea that he's aroused (it's enough of a shout out for me, but not sure about others). Well, some ideas:
- Like mentioned before, covering his face with his sleeves, implying a nosebleed
- Being embarrassed/uncomfortable and blushing in general
- Having a strand of hair stick straight up (probably too much of a sexual innuendo)
- You can probably do some symbolism with his katana (again, probably too much of an innuendo)
- You can do something more innocent. Perhaps during the victory pose, have him blush and flowers bloom in the background around him. Heck, instead of blood, make him spew out flower petals from his nose
sorry I'm getting too carried away. I guess my point is that they don't have to go with actual nosebleeds, though I agree that they're established in his character in Captain Rainbow.
Smash is non-canon anyway, so if Takamaru gets in, I don't really mind what they do with his character, as long as he's tolerable. That being said, I can't really see them steer away from giving Takamaru a stereotypical honourable samurai personality. Who knows...