His parents were scientists they created a protector of his son named Garo who could turn into a wolf, bat, crocidle monster. They were killed by his grandfather due to thinking Tatsuo was one of their creations. Garo saved him and gave him to the Kagura family who raised him. Years later still remebering what happened to his parents he beacame the Skull Man. Him and Garo killed anyone responisble for his parents death usually resulting in bystanders getting killed in the crossfire. He finally finds who killed his parents and learns he has a sister. His grandfather then set fire to the building resulting in their deaths. Years later Tatsuo and his sister somehow survived the fire. He now is finding allies to join him into finding out who is creating mutants. his weapons are Possesses super