Rekuta Kadoko

Rekuta Kadoko (角古 れく太) is Shobu's best friend and loyal side kick. Even though he is an expert at the rules of "Duel Masters," Rekuta is a terrible duelist, often going without a single win during a tournament. He's often seen with his portable laptop to keep track of important duels. As a running joke, he is often accidentally sent flying into the air. In one instance (which only occurred in the English version), he was sent flying into space (against a live-action backdrop) and crashed into a space station. He has almost every card ever released (since his father owns a card shop) but cannot correctly use the cards.

His correct surname is "Kadoko" (角古) NOT "Kadoka" (かどか) which is actually japanese female given name. When spoken in Japanese (i.e., putting the last name before the given name), his name is actually a pun on Kādo Korekutā (カードコレクター), which is a Japanese katakana transliteration of the English phrase "card collector".

In the Japanese manga, his hobby in card collecting and knowledge of cards, often helps Shobu towards winning a duel.