If you're looking for manga similar to Uzu Majin, you might like these titles.
Imagine a world full of flying dragons, talking mushrooms, burning forests, supernatural bisons and many more strange creatures... Well, Mondo, Rokuna, and Dr. Hiiragi go on some crazy adventures taking on lions and crazy monsters in hopes of creating a passageway between worlds so humans and monsters can live together.
14 years after Atlantia, the largest country in the world of Legendia, was torn apart by riots, Tatewaki Tsurugi was secreted away from the chaos at a young age. Oblivious to his true birthplace, Tsurugi grows up as a spirited boy in the neighboring rocky land of Pacifis.One day, Tsurugi suddenly comes across the Shining Sword, and his great adventure begin. An army of darkness is hunting down the 12 Sword Braves, and as the army pursues Tsurugi, a figure appears before him. Bringer is a Card Battle Droid entrusted with the duty of protecting Tsurugi. Trained by Bringer in the ways of the Battle Spirits combat, Tsurugi joins the other Sword Braves in rising up against the army of darkness with his Key Spirit Shining Dragon.
Yuzu Hiiragi and her father run a Dueling school that’s seen better days. If only they had a star teacher to bring in new students! When a rogue Duelist known as Phantom appears in the city, Yuzu may have found a savior, but Phantom will have to deal with the Leo Corporation’s special forces before he can get into any community service!
Hot-blooded highschool girl, Asuka Matsumoto, struggles as the manager of a card shop in place of her father. Even so, aiming for Asuka's special cards, are the assassins of the card gang "Crown" who will attack one after another.