"I'm sorry Dante, but I think I dropped a very important letter. Could you pick it up for me? Thanks. By the way, do you want to go to the bar to sing karaoke with Sakurai later?"
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EDIT: Jokes aside, I think Kiryu has a pretty big shot of being a post-pass character. Yakuza is extremely popular in Japan, and it's been getting more popular in the West too, lately. SEGA is already present in Smash, and Kiryu's fighting styles would fit really well with Smash too.
I'd even go as far as to say Kiryu is more likely then Arle, and probably the most likely next Sega character barring another Sonic character.