- Mirio’s birthday is July 15th, he’s 181cm tall, his blood type is O, he was born in Chiba Prefecture, his favourite food is ramen and his favourite thing is comedy.
- Horikoshi has said he considers Mirio an easy character to draw because of his simple facial features.
- Mirio shares his birthday with Midoriya and also Rapt Tokage (a character featuring in MHA Vigilantes.
- As a child, Mirio is voiced my Megan Shipman in the English dub – who also voices La Brava.
- Mirio’s name contains the kanji for ‘through’ (通 tō) and ‘form’ (形 gata). The kanji read together can also mean ‘conformity’ (通形 tsūgyō). His first name comes from ‘million’ (ミリオン mirion). Alternatively, the ‘to’ is a possible reading of ‘ten’ (十) which can refer to the fact that he would have been the 10th User of All for All if All Might passed it onto him instead of Midoriya like Sir Nighteye wanted.

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