The Karateloid is a Messianic Metaloid that is created when Messiah Card 03 infects a karate fist guard. Also he's the main antagonist in episode 39 of 2012 TV series called Tokumei Sentai Go-Busters.
He is voiced by Hiroyuki Muraoka who previously voiced Blizaru, Zukangami and later voiced Domeloid, Meshiubaindaver, Ruretta Gerou, a Whac-A-Mole Jamen and both the Daikon World and the Great Daikon World.
It is sent to investigate human instincts to report back to the rebuilt Messiah. Its left leg has the power of Messiah in it, enabling it to move its leg faster than can be seen by the naked eye. It seeks out the child Kenta for its studies on instincts.
A while later the Karateloid now possessed the young boy as it used its own data to transfer the red karate fist guards on some passerby citizens and commence them to fight each other as he joined the battle. As this goes on Masato and Beet try to stop the bot, but now they have to battle Escape while Ryuji saves Kenta from the Metaloid. As this goes on Kenta stopped his body from attacking an overheated Ryuji. After that the karate fist guard then morphed into Karateloid as it battle Ryuji in his Power Custom. After that due to an overheated Ryuji he tossed the data of a rock at the Karateloid and then it was destroyed when Yoko used the Lio Attaché and open fired on it.
Super Hero Taisen Z
Karateloid was part of an Army of Resurrected (mostly Super Sentai) monsters led by Space Raider after the revival of Madou Demon King Psycho. They proceeded to attack the gathering of Kamen Riders and Super Sentai, giving them a hard time. The heroes of recent years were in a pinch until the arrival of a force of Sentai and Rider reinforcements led by Akarenger and Kamen Rider Ichigo. The combined forces of superheroes were able to turn the tide against the Madou army. They lined up and used their various finisher attacks to destroy the revived monsters.