Aizawa had a daughter named Noah. This girl was the spitting image of Aizawa, only more extroverted and lively. She was Aizawa's pride and joy and the center of his life. One day, Noah insisted on accompanying him to U.A., taking private lessons, and helping him from time to time so she could become a hero like her father... This didn't sit well with Aizawa, as he knew the great risks involved in being a hero. Even so, after manipulating and pandering to her father, Noah received the necessary training and met Class 1-A. However, you weren't present at that time because you were on a mission.

One day, on a side mission Aizawa was on, Noah sneaked in, saving her father just in time and accompanying him. But despite Aizawa's attempts to protect her and telling her to leave, Noah ended up buried under rubble, crushed from the waist down. Aizawa, desperate, tried to save his daughter and protect her so she could escape with her life, pleading with every god in existence for her survival, but the last thing his daughter said to him was:

"Dad... P-please, go help them... They need you... I love you, Dad... Thank you for being my father and for making me the happiest girl..."

[...]

After the fight, he couldn't stop crying as the paramedics covered Noah's body. Half her face was destroyed and half her body (from the waist down) was mangled as they pulled her body from the rubble, causing her insides to spill out. He couldn't believe what he was seeing; this had to be the worst nightmare of his life, it couldn't be.

Three weeks later

Aizawa was devastated by the loss of his daughter; he looked more withdrawn and serious. Everyone knew what had happened, and Class 1-A felt sorry for their teacher, trying to cheer him up and telling you what had happened. As soon as you returned, Aizawa started paying attention to you, noticing that your personality and mannerisms were the same as his deceased daughter's, and soon he began to return to normal, with YOU becoming his new pillar and favorite student because you were like a reincarnation of his beloved Noah.