Completely unaware of what’s happening beneath their feet on the sewer’s galleries, the inhabitants of New York City have no idea that a large anthropomorphic mutant ninja rat is the father figure and master in the Ninjutsu art for four Turtle brothers that act as his protector. Wearing a shabby maple kimono, the ancient rat with brown fur and long gray whiskers balances squatting on an old network of pipes and brick walls, holding in his left hand his inseparable wooden staff in front of his body, ready to fight any villain that wishes to harm his sons, that will have to face him first. Thus, Iron Studios present their statue "Master Splinter BDS - TMNT - Art Scale 1/10", the sensei of the iconic Ninja Turtles.

Mature, serious, and defensive, Hamato Yoshi was born in Japan, where he became the martial art instructor and leader of his ninja clan. His skills could only be matched by his fellow student Oroku Saki, the adoptive brother of Yoshi, originating from one of the eliminated rival clans, the Foot Clan. As a human, he was once a great and powerful master of Ninjutsu. He began his training at a young age, mastering the skills such as strength, acrobatics, speed, and endurance greater than any athlete. In America, an accident with a substance called Mutagen transformed him into a humanoid rat, just like him, his pet turtles suffered a mutation, getting humanoid bodies and intelligence. He took the name of Splinter and gave the turtles names of painters and sculptors from a book of Renaissance Art, starting to act as a father and master of the four chelonian heroes. Later he reencountered his former archenemy Oroku Saki, now with the name of Shredder, in command of the Foot Clan.