If you're looking for manga similar to Reprise, you might like these titles.
It's about a boy named Tekkon. Tekkon at first just loves baseball and has no interest in Zoids, calling them kid's toys. However, this changes after he meets a man called Commander O, and Tekkon quickly finds himself deep in the world of building models and participating in various competitions. He makes various friends along the way.
Dr. Kaneda was developing experimental giant robot warriors to fight the allies during the Second World War, but before his creations could see action, Allied bombs destroyed the facility and killed him. A decade later criminals discovered two of the surviving prototypes, #26 and 27 in the series, and used the remote controlled robots to commit a number of crimes. Young Shotaro Kaneda, the twelve year old son of Dr. Kaneda, did some investigating and discovered that the mob were hunting for the twenty-eighth robot in the series, rumoured to be the most powerful of them all. Racing the villains, Shotaro discovers the robot first, along with Dr. Shikishima, a colleague of his father who was also believed to be killed by the Allied bombing. Together the two prevent Tetsujin 28-go (the robot's official designation) from falling into the hands of the bad guys and decide to dedicate him to peace rather than war.
Includes the following chapters:
A mysterious monster called the High Beast, has taken control of the regions of Eurasia and Africa. Japan has cut off from the mainland to protect itself from this threat. The daughter of a legendary mahjong player discovers that monsters attack whenever a mahjong piece is hit across the board. This allows humans to be separated from the battle and for mahjong players to effectively combat the monsters with robots controlled through mahjong moves.