King Caesar

King Caesar is a lion-like kaiju that resembles a deity. He first appeared in Godzilla vs. Mechagodzilla, and reappeared in Godzilla: Final Wars.

Godzilla vs. Mechagodzilla
King Caesar is the guardian of the Azumi family. He could be awakened by fulfilling a prophecy and an ancient song. The Black Hole Aliens knew that Caesar would awaken to prevent them from world domination. After Mechagodzilla was repaired after being damaged by Godzilla, they launched him to find King Caesar and kill him before he awakened. This was unsuccessful and Caesar woke up and confronted the robot. At first King Caesar had the upper-hand, absorbing Mechagodzilla's eye lasers and firing them back at his adversary. However, Mechagodzilla proved too strong even for him and nearly killed Caesar. However, Godzilla arrived and battled against his mechanical copy. Mechagodzilla fired all of his arsenal at both King Caesar and Godzilla, beating them back. Godzilla, due to being struck by lightning earlier, gained a magnetic attraction and used it to pull Mechagodzilla to him. King Caesar then rammed into the mecha before Godzilla gains the upper hand and finishes him off by twisting his head off. King Caesar then returned to his rock dormant.

Godzilla: Final Wars
King Caesar is one of the many monsters controlled by the alien race known as the Xiliens. He attacks Okinawa (ironic, as he was the protector of Okinawa in the Showa era), an Island part of the Kyushu archipelago in Japan. Caesar stomps through a factory, crushing everything in his path. Suddenly, an enormous flying object appears and removes Caesar. The same thing happens with the other monsters around the world. The Xiliens lie, saying they destroyed the monsters to save Earth and that a meteor is heading for Earth, threatening all life. The humans eventually discover the Xiliens plan and that Gorath does not exist, so the aliens release the monsters on Earth again. However, the humans release Godzilla from the south pole and he fights the monsters. King Caesar, Rodan, and Anguirus team up against Godzilla, but are all quickly overpowered and thrown on top of each other instead. Godzilla then moves on, not killing them. The reason is because in the Showa era they were Godzilla's allies. What happens to them next is unknown however.