Ryusei Koki wears the default male school uniform, unless customized by the player.
Ryusei Koki has cobalt blue colored hair swept back slightly to the right, with two strands sticking out to the right. His eyes are cobalt blue as well.
Among the types of personas included in the game, he is a Teacher's Pet. If Ryusei sees a corpse or sees Yandere-chan murdering any other person, he will report it to his favorite teacher. He cannot fight back if attacked.
At 7:05 AM each day, Ryusei will enter the school ground sixth in line on the left to school. He walks to his locker at 7:10 AM. At 7:15 AM, he will walk to the plaza, in the right side of the fountain, to gossip.
At 8:00 AM Ryusei will walk into Classroom 2-2 and sit in his seat. He will start class at 8:30 AM, and will leave to go to lunch at 1:00 PM.
Since he is an average NPC, he will have no special events, so he gossips with his group during lunch.
Ryusei walks to class again at 1:30 PM and will finish second period at 3:30 PM. He will then go down to his locker and will linger there until 3:50 PM, when he walks home.
- Ryusei may or may not remain in the game for he is not a true character and just a test dummy for debugging. If he does remain, he may undergo heavy change.
- His name is a reference to the most popular male Japanese names for 2012, 7th most popular being Ryusei, 8th most popular being Koki.
- His counterpart is Mei Mio.