Tyson's grandfather is a living kendo master. He welcomed his grandson to his dojo after Yoshie passed away. Practicing swordsmanship, specifically kendo, he tries in vain to teach Tyson some techniques, but Tyson has other interests.
The elder Kinomiya is an enthusiastic and energetic character. In the Japanese version of the anime, he is more civilized, while in the English dub, he adopts a "cool-yo" persona. Occasionally, he follows Team BBA around the world to support them during tournaments. In Japan, he also provides accommodation for the team.
Generally, he mostly creates comic relief, but occasionally (and unintentionally) he makes Tyson realize important tips for beyblading, such as the winder lengthening trick. For family reasons, Ryu's dojo housed the sword-shaped stone inside which Seiryuu was trapped.
In G Revolution, he temporarily took the place of the fifth member on Tyson's G Revolutions team as "Mr. X." This was only temporary because Tyson was searching for the appropriate beyblader to complete his team, and Kai was nowhere to be seen. However, the Justice 5 tournament rules required him to submit a list of players before a certain deadline.
