As someone who states that they're nothing more but an empty husk of their former self, Ryoma has a sense of coolness built into his character due to past experiences that have been compared to put an adult to shame. He's the calmest and most composed character within the cast of students. His younger self was one that loved animals so dearly, and still holds that even after his change. Though he may not come off as aggressive at first glance, the tennis player will resort to harming people if he feels it is necessary and that the presumed victim deserves it.

Ryoma's voice is a surprisingly low voice that can sound like a growl at times. A hint of a rasp can be an excellent touch, though it's also optional.