Hisashi Midoriya

Hisashi Midoriya (緑谷久) is Izuku Midoriya's father.

History
At some point in his life, Hisashi married Inko, who eventually gave birth to their son, Izuku.

Quirk and Abilities
Fire Breath (火休み Hi Yasumi): Hisashi's Quirk allows him to breathe fire.

Trivia

 * His name, Hisashi, roughly means "a long time ago". It is a reference to the sentence hisashiburi (久しぶり), which means "it's been a while (since I last saw you)", hinting at his absence along the story.
 * It's also the same kanji as the "Ku" in Izuku's name.