DadMight

ToshiDeku is the familyship between Toshinori Yagi and Izuku Midoriya from the My Hero Academia fandom.

Canon
Izuku has always admired All Might since he was a small child and wanted to be a hero just like him. At their first meeting, All Might thought that Izuku was just a fan, but he started to acknowledge him when he jumped to save Katsuki from the Hedoro Villain. From that moment, he was touched by Izuku's bravery (despite not having a Quirk) and decided he would pass his powers to Izuku, feeling that he is the only one worthy enough to inherit his strength, and they started to share a feeling of mutual respect for each other. He himself even mentioned that he has no regrets passing One For All to Izuku.

All Might is his confidante, mentor, friend in and out of school, and they share a mutual respect for each other's heroism ideals. Izuku's admiration and respect for All Might is so great that he had trouble trying to attack All Might during the End of Term Test, and when he had no choice but to attack All Might with Katsuki's Grenade Bracer, Izuku apologized.

Toshinori started to open up to Izuku as he sees his growth, going as far as to reveal personal details about his past such as how he was Quirkless, his fight with All For One. He continues to express his pride in his growth as a hero.

Fanon
On AO3, it is the second most written relationship for Yagi and the sixth most written for Midoriya.

Fandom
FAN FICTION
 * Izuku/Toshinori tag on FanFiction.Net
 * Izuku/Toshinori tag on FanFiction.Net