Holy Grail War No.: 4th Holy Grail War Rider was originally meant to be summoned by Lord Kayneth El-Melloi Archibald, but due to some circumstances, he ended up being Waver Velvet's servant. Iskandar, or how he refers to himself, the King of Conquerors is a noble and courageous man, who prefers to conquer his enemies by winning without killing and controlling without humiliating them. He is known as a marvelous ruler who once almost conquered the whole known world. He is not pragmatic, but is a person who lets history run its course and acts according to his impulses. While he is wild and somewhat inconsiderate to others, his greed ultimately resulted in the happiness of the people he ruled over. In the new era, Rider is mostly amazed by ordinary modern things, and usually spends his free time exploring modern war vehicles and machinery.

He is the leader of the street racers called "Red Suns." One of the most talented and skilled drivers in the Gunma prefecture. The older brother of Takahashi Keisuke, who also drives for Red Suns. To win races he thoroughly analyzes his opponent and the course to come up with an optimal strategy. Has an extraordinary ability to study technical data and set his car up to perform its best. Has been called "Akagi's White Comet" and is also the founder and manager of "Project D," a street racing team started solely for the purpose of capturing every time attack record in Japan.