Mecha Jr.

Mecha Jr. is the midboss of the Lava Pits in Mario + Rabbids Kingdom Battle. As its name suggests, it is a mecha operated by Bowser Jr., with long legs, a vice claw, and a hammer resembling a cow. It also had Spawny in its grasp. It also has structures that resemble Rabbid ears on it.

Mecha Jr.'s attacks are similar to that of a Smasher's, in that it moves prematurely towards its attacker when attacked. It may also lure characters closer to it.

When defeated, it is destroyed, and Bowser Jr. drops Spawny in his haste to escape. Yoshi, however, rescues Spawny, and both join the group.

Trivia

 * A diagram of, what appears to be Mecha Jr. (albeit with a much different appearance), can be seen on a chalkboard in the background of the battle arena.