BACKSTORY: Unlike his brother, who spent most of his time with something scientific, Jonai joined the disciplinary committee of his middle school. Being the most mature and serious of the committee, it wasn't long before teachers began to treat him with more respect. Jonai was quickly recognised as the most behaved and intelligent student once he got into high school. He was later scouted as an Ultimate along with his brother for Hope's Peak.

PERSONALITY: Jonai is a lot more well behaved than his brother, making people mistake him as the older one. Unlike his brother, who is fearless, and sometimes careless, Jonai is more careful and more fearful. Jonai usually scolds his brother for his unrequited and childlike behavior, and apologizes to people about it if they seem to witness Hisao's behavior. Even though it seems like he doesn't, Jonai loves his older brother unconditionally, even if he does get on his nerves sometimes. Also, Jonai refers his older brother as 'Onii-chan' whenever Hisao and himself were in a group of people. Others asked why Jonai does this, and he simply says that he "lost a bet" to his brother. He never disclosed what the bet was about, but people know that Jonai was the loser.

VOICE DESCRIPTION: Jonai should have a medium to low pitched voice, since he is much more mature than his older brother, so his voice should reflect that.