Shuu Kurenai

Described as a genius blader, Shu is a favorite in his hometown. However, he does not rely on talent alone and is very hardworking when it comes to Beyblade. He is one of the best bladers to ever play the sport, managing to surpass Valt Aoi and win his first WBBA tournament in less than a year. He is also the best friend of Valt.

In Season 2 he becomes the main antagonist.

(Source: Beyblade Wiki)