Just have to say, even though I'm not too familiar with Ayumi, the Fighters Pass you've suggested looks close to perfect! Not being familiar with that one character would actually make her a good addition too, I love learning about new characters or just finding a character I enjoy based on their moveset alone. All of your picks are great! And Kazuya would be awesome. I'd personally prefer Jin just because of a little bit of bias to his moveset, but, Kazuya I could absolutely see working in Smash. Heihachi would work too, of course. Any of those three would be a hype as hell addition.