Riku is a calm, cool, collected teenager who is not afraid to go beyond his limits. He shows a great amount of loyalty and protectiveness for his friends. He is also very competitive. Riku is shown to be fiercely dedicated to his best friend Sora throughout the series. During the Mark of Mastery exam, he saved Sora from the darkness on top of fulfilling the regular examination and he is now a Keyblade Master.

In Persona 5, Maruki is a voluntary counselor who cares about the students in Shujin Academy. He is quite friendly and is extremely patient, allowing them to control the flow of their conversation. He is alert and quick to pick up on minor comments made by his patients that helps open them up. He is also highly clumsy, quirky and is prone to messing up in comedic situations, unlike most of the teachers who have no-nonsense attitude. He offers snacks at all his counseling sessions