Sushi is a quiet and timid Felico who mainly communicates via body language after an incident. She is often lost in thought and has a calm demeanor. Sushi's reserved nature makes her appear aloof to those who don’t know her, but those who take the time to get to know her will find a loyal and thoughtful friend.

NOTE: She hardly has any lines so throughout the time, making any sorts of sounds would probably be enough.

Ref:

https://www.deviantart.com/ev-zero/art/Sushi-Roll-Info-977481098