Agent S

In the anime and manga he is a member of RI-ON.

About
A mysterious member of RI-ON. Not much is known about him, except that he is close friends with Agent L, a chain smoker, and a superb computer programmer. He acts as a double agent for RI-ON and Agent L; once, under Saizou's orders, he loads a dimensional portal for Kohei and Hideaki to use to return to Earth, yet, using his computer skills, he unlocks the code used to keep Agent L locked inside the storage room. In the epilogue, Agent S changes the program that uses personality data to match Dragon Drive players with dragons in order to avoid Chibi from being involved in Dragon Drive again. However, this doesn't work because Chibi is once again matched with Reiji.