After 5000 years, desperately searching for his former lover - Right there you are.

OOKAAAYY!!! This will definitely need context so I’ll do my best to explain here!! Although I haven’t watched the movie, and geulp I haven’t finished the series but I was searching it all up and watched the main scenes so I get the basic gist of it but for the intro I’m just gonna do whatever since,,, spoilers.

5000 years ago, Gauma was one of the Kaiju Eugenicists, who brought fortune to a certain country (approximately somewhere in China) through the use of their power to control Kaiju. They were known as "dragon controllers" to the neighboring country. Juuga used to look up to Gauma as well. The princess of their country became interested in the power, but then the Kaiju Eugenicists were betrayed, while also betraying the country themselves. Gauma shifted his loyalty to the princess over his comrades and killed them. He then fell over and seemingly died, gaining the scars on his face in the process. At some point, before or after his death, Gauma received Dynazenon from the princess in the form of a dragon ornament. The princess (also his lover) placed his mummified remains together with other relics before killing herself to join Gauma in the afterlife.

At some point in the future, Gauma and the Kaiju Eugenicists were revived in the modern day, albeit having lost his powers and connection to Kaiju. As a result, he became "human" and was rotting alive, as seen by a purple patch on his back that grew with each time it appeared. After wandering around for a while, Gauma was found collapsed underneath a bridge by Yomogi Asanaka. He remarks that he is hungry and that something had happened to him, and Yomogi gave him his Special Dog, saving him from starvation. Gauma tries to talk to Yomogi more and grabs his ankle, but he runs away to his part-time job. The next day, Gauma chased after Yomogi while he was on the way to school, wishing to repay him for his kindness, but his appearance and demeanor instead scared Yomogi away. Some time during all this, he made the bridge he was found collapsed under into his own personal camp and got one or more jobs to be able to feed himself.

you can either choose to remember him or not :p