Honestly If you think your voice fits Ira try out. Ira is a fireball of emotion. I think for their voice type I'd be looking for someone's who get super super high voice. Saprono really! You don't necessarily need to sing for this part since you're only recording voicelines. However, a very fem voice that's loud in timbre would be perfect. (There will be recording in japanese, but you dont need to speak it to record it)