The Rising of the Shield Hero Audiodrama (Book 1)
Devin_DK for Itsuki Kawasumi
In short, he's stuck up, gullible, and wants to be praised by others.
The voice we're looking for is one that's higher and along the line of "I'm above you".
(introductory) Ok, my turn. I’m Kawasumi Itsuki. I’m 17, and still in high school. (nervous) Level 1... that makes me nervous.
(shocked - can't believe Naofumi would do such a thing - serious) Me too. Even at that though, I never thought you’d stoop so low. You must think you’re somehow entitled to whatever you want! You have no sense of responsibility or justice. You ignore the task you’ve been entrusted with, only to attack a poor girl… Just terrible…
(calling Motoyasu out - serious) Motoyasu, you lose the duel. You broke the rules. Naofumi knew he couldn’t win, so he just did all that he could to hurt you. I don’t think we can begrudge him that.