Yūma Tsukumo is the main character in the anime series Yu-Gi-Oh! Zexal. He is a passionate Duelist who aims to become the best in the game of Duel Monsters. Yūma is known for his optimistic personality and his ability to connect with his Number cards, which are powerful and unique monsters that play a crucial role in his duels. In the series, Yūma often battles against various opponents, using his skills and strategies to overcome challenges. His main companion is Astral, a mysterious being who helps him unlock the secrets of the Number cards. Together, they embark on adventures to protect the world from dark forces threatening the Duel Monsters universe.