Mechagodzilla. It's costume can be made in the Godzilla Kaiju Costume Pack. He is the cousin of Little Big Mecha-G 4. His chip program is defective, which means he can be mean or polite at any time. However, he is always friends with the alien kaiju. The sack version has no weapons and can be destroyed by missiles, fire, electricity, plasma, drowning and gas, but Paintinator paint has no effect on him.
Big Big Mecha-GEditBig Big Mecha-G "Mechagodzilla" is a closer counterpart to Mechagodzilla. He appears only in Mechagodzilla Avenges Ghidorah, being the boss (LBPG:Series). When the Vortaak learned that King Ghidorah was destroyed, they immediately sent Mechagodzilla. Japanese Boy saw him and warned Sackboy he was coming. Godzilla went to the ruins as well, and Sackboy and Godzilla teamed up. Sackboy brought a Paintinator to use against Mechagodzilla. But MG had a Beam Template, and aimed straight at Godzilla's head (where Sackboy was). But Godzilla had (strangely enough) a force-field that Sackboy could lower or rise to shoot and evade. This was succesful and eventually Mechagodzilla burst into flames and dissolved. Mechagodzilla's blueprints were "perfected" and the Vortaak remade him into Mechagodzilla 4000.