Big Chungo

He is the trainer of chungus. He has mastered Chung Fu and was the father of Sans Undertale. he first appeared in Big chungus:Origins.

History
in a casual battle within Big Chungus: Battle Royale, somehow he was born, the newborn would win that royale. Eventually, chungo spent decades training until he mastered Chungu fu. He would settle down with an unnamed wife eventually and would give birth to sans undertale. Sans(undertale) would fall to the dark and eventually he would teach chungus to defeat sans undertale