Bakugou is raised by Inko

Due to a villain's attack, both Masaru and Mitsuki Bakugou unfortunately ended up in a coma. It has been many years since then and Katsuki Bakugou has been raised mostly by Inko Midoriya.

The young Katsuki was only five when this tragedy ocurred, and had to protect his little brother from those who would target a Quirkless person. All the while encouraging Izuku to train so they could attend UA together as heroes.