Not much is known about the personality of this Team Iwatobi first-year just yet as these are the only individual lines he's had so far in two episodes. From what can be seen, he's an average sixteen-year-old. He has a deeper register than Romio, but obviously should still sound appropriate.
Note: There will be 20 minutes of new content for this project every week until the end of September. If you can't be sure you will be available for the entire project it would be better to not audition for this role as deadlines must be met.