Somehow, developer CyberConnect2 is making a game that is neither Naruto nor .hack. In fact, Solarobo for DS is a spiritual successor to CyberConnect2's 1998 PlayStation game Tail Concerto. Like Tail Concerto, Solarobo is a platforming action RPG starring anthropomorphic animals in walking mechs.
As Red Savarin, you pilot the robot DAHAK-AZI03 on bounty hunting missions. Without weapons, your only method of combat is picking up and throwing objects using the robot's arms. Solarobo is due in Japan this year from Namco Bandai. It features some kind of 1-4 player support, but the details of that have yet to be released -- as does any information about a release outside of Japan.