Shadowmaru

A large ninja robot that transforms into a kind of police car, an artillery tank, a jet, or a giant German shepherd. He can also transform into the Brave Cannon (ブレイブキャノン), a massive gun that is supported by J-Decker, Duke Fire, Gun-Max Armor, and Super Build Tiger in a team attack. Unlike other members, he is equipped with many difference sensors, he is able to detect things that other members cannot. He usually does all the research and detective work as he is an expert in that area. He is the only member of the team that does not unify with other members.

(Source: Wikipedia)