Kyoichi "The Masked Rider" Shido

Makoto's older brother, and a trial bike champion. He appeared in masked form in early episodes up to episode 5 when his identity was revealed. He was captured by Mr. Teacher when trying to find out more about Team ST. He later helps Sho fight Gabu. When it came to Team X, he ended up under the control of them and is trying to fight the Dark Emblem's control. Sho managed to defeat him. His MTB is Thunder Emperor (Thunder King in the English anime), but rode Imperial Tiger when under the control of Team X.