Goro Daimon is a character from King of Fighters. He marks the official debut in the Metal Slug universe in Metal Slug Defense as a KOF20th Anniversary Collaboration Campaign.
The designers had a desire to create a judo athlete who uses dynamic body tosses. Despite the critacisms, the creators were very adamant that Daimon would fight with his Japanese geta (wooden clogs).
The idea for his earthquakes -as well as the other elemental powers for the rest of the Japan team- was derived from the anime Getter Robo. In the show, there were three featured heroes who served as the inspiration for the KOF trio: the protagonist had a "fiery" persona, his friend was "edgy and daring", and the third hero was the "down-to-earth giant". It is also a homage to a Japanese phrase of giving birth to fire (roughly translated: lighting strikes the earth which sparks the flame).