When Mizu was born he never really met his actual birth mother. His dad told him that she passed away giving birth. He mostly wanted to be a pro hero seeing how his dad was a hero as well. Honestly if you were to ask him this, he would say he would want to fight by his dad side and become his dad's sidekick. Then when he was in middle school everyone looked at him strangely and started to make fun of him for his dad having a odd quirk and mocking him and would also tease him for not having a mother figure. He honestly was hiding the fact all of this was happening till a kid came out of no where and actually stood up for him. When he left his school to the UA he met all of these kind kids and was about to start a journey that he would never forget.