Also mid combo izunas
Like if the conditions are correct during mid combo you can do an input and ryu would do a cool launch animation and go for an izuna
I think a little RPG element would be cool like you can call in the other ninjas for help
Hayate: Attacker
Momiji: Support
Kasumi:?
Ayane:?
Rachel: Tank lol?
And like under the ninpo bar there would be another bar that you have to fill to call for support or maybe instead of support you fill the bar and depending on which character you pick you do a duo combo together and destroy everything onscreen or an ultimate ninpo