If you're looking for manga similar to Cosmic Break, you might like these titles.
Although born into the prestigious Sturgeon family, young Sumner spends his days asking himself what it is he wants to do with his life. That is until he sees the much talked about lift boarder, B.B. Having witnessed B.B.'s victorious performance in a tournament, Sumner can't wait to meet him. But when he steps into B.B.'s dressing room, he walk's in on a girl who's only halfway dressed and nothing will be the same again...!
Medabots follows the adventures of ten-year-old Ikki, who knows everything about Medabots and Robattles but doesn’t have his own Medabot — until Metabee comes along. Ikki must contend not only with Metabee’s sometimes unpredictable behavior but also with two gangs, the Screws, Ikki’s schoolmates, and the criminal Rubberobos, who want Metabee for their own nefarious purposes. Can Metabee help Ikki foil the thieves trying to steal his Rare Medal?