Mutenroshi, known as Kame Sennin, the Turtle Hermit, and also referred to as Muten Roshi, is a central figure in the Dragon Ball universe, first appearing in the original Dragon Ball series and continuing his role in Dragon Ball Z Kai. He is an elderly martial arts master, easily recognized by his bald head, thick white beard and mustache, sunglasses, and his habit of wearing beach attire or a martial arts suit, often with a turtle shell on his back. He resides on a small island in a house called Kame House alongside his longtime companion, a sentient sea turtle named Umigame. Born over three hundred years before the events of the series, Mutenroshi is a legendary figure who was once considered the strongest mortal fighter on Earth and is remembered by many as the God of Martial Arts. His background includes training under the great master Mutaito, alongside his rival Master Shen, and witnessing his own master sacrifice himself using the Evil Containment Wave against King Piccolo. This event deeply shaped his understanding of martial arts as a responsibility. Mutenroshi is a character of stark contrasts. On the surface, he is a comedic figure defined by his lecherous tendencies, frequently making inappropriate advances toward attractive women, reading adult magazines, and engaging in foolish whims. This behavior provides much of the series' early humor. However, beneath this facade lies a deeply wise, perceptive, and kind-hearted individual. He is cantankerous at times but genuinely loves his students as if they were his own grandchildren. His motivations stem from a desire to pass on the true spirit of martial arts, which he believes is not solely about winning but about personal growth, discipline, humility, and protecting others. He is willing to sacrifice his own life for a noble cause, as demonstrated when he attempted to use the Evil Containment Wave against King Piccolo, fully knowing it would cost him his life. Mutenroshi's role in the story is foundational. He is the creator of the signature Kamehameha technique, a powerful energy wave that becomes the most iconic move in the series. As the founder of the Turtle School, he is the first true master to train the protagonist, Son Goku, as well as Krillin and Yamcha. His training methods, which involve grueling everyday tasks like delivering milk, farming, and swimming against strong currents, are designed to build not only physical strength but also mental fortitude and character. He also trained Grandpa Gohan and the Ox-King previously. To prevent his young students from becoming arrogant, he secretly enters the World Martial Arts Tournament under the disguise of Jackie Chun, ultimately defeating Goku in the finals to teach him a crucial lesson about humility and the endless path of improvement. In Dragon Ball Z Kai, his role shifts from a frontline fighter to a wise supporter and mentor. As the power scale of threats like the Saiyans, Frieza, and Cell far exceeds his own, he acknowledges his limitations and steps back from direct combat. He instead provides guidance, strategic advice, and emotional support to the younger Z Fighters, watching proudly as his students grow to protect the Earth. His key relationships include his students, particularly Goku and Krillin, whom he treats as surrogate grandchildren. He shares a friendly rivalry with Master Shen, and he has a familial connection to his older sister, the fortune-teller Baba. Despite his perverse nature, he maintains a close bond with his friends and is deeply respected by even the strongest warriors. His development is marked by a gradual acceptance of his diminished physical power while reaffirming the value of experience and wisdom. In later arcs, such as the Tournament of Power in Dragon Ball Super, he returns to the forefront, demonstrating that his centuries of martial arts experience, strategic genius, and perfected technique can still overcome younger, physically superior opponents. Notably, he learns to control his desires to maintain his focus in battle, showcasing personal growth even in his old age. His notable abilities are extensive. He invented the Kamehameha wave, which he can amplify by increasing his muscle mass and heightening his energy, a state that once allowed him to destroy the Moon. He is a master of ki manipulation and can use techniques such as the Afterimage Technique, the Thunder Shock Surprise, and the Evil Containment Wave. His combat style is defensive and economical, relying on his immense battle experience, sharp reflexes, and perfect technique rather than raw power, allowing him to outmaneuver opponents who are superficially stronger. Mutenroshi remains an irreplaceable pillar of the Dragon Ball story, embodying the foundational principles of martial arts that shaped its greatest heroes.