Kaoru Sakurayashiki is a skilled skater and founding member of "S", he uses his AI board to skate in a calculated and logical fashion. 

Kaoru is calm intellectual, well-known even outside of "S" as a famous and successful AI calligrapher. He's been shown to treat clients and strangers with polite respect,[3] but is often prickly towards those closest to him, most prominently his fellow "S" member and childhood friend Kojiro Nanjo. Kaoru often loses composure when dealing with Kojiro, perhaps due to their contrasting personalities, and the two usually end up bickering and calling each other names whenever they disagree about something.

Kaoru is also notably competitive when skateboarding, always wanting to beat Kojiro during races and beefs and even getting Carla to record his time during the tournament preliminaries to see how it measured up to Adam's.[4]