Voice Actor: Gideon Emery (https://www.youtube.com/watch?v=6clcP6V2cgk)

Asugi is the son of Saizo, the nephew of Kaze, and the cousin of Midori. Like the other children of Fates, Asugi was placed in the Deeprealms to protect him from the war. As the son of Saizo, Asugi was given training in hopes of having him succeed as the sixth in a line of Saizos, given that he is the first born son. However, the pressure of becoming the next Saizo proved too much for him and he decided to discard that name, instead naming himself Asugi. According to him, that name means "gray". Sometime later, Asugi was hired by bandit gang lead by Funke who wanted to raid a nearby mansion. Although paid by candy, Asugi had doubts of the mission and wanted out.

A cool, sharp and able person, Asugi worries about inheriting his father's legacy, as he has little in common with his father. He is not particularly motivated to succeed him, given that his father hardly spent time with him growing up due to the nature of the Deeprealms, but he is extremely fond of both eating and making his own sweets and carries them around at all times, even being able to replicate several recipes just from eating the desserts, though this tends to conflict with his father Saizo, who hates sweets. With his confections having a cutesy aesthetic, he even bonds with Ignatius over their mutual love of cute things, but while Ignatius is shy about it, Asugi proudly declares that there is nothing wrong with that.

Though he at first appears to be a rather easygoing character, he is very strict on himself when it comes to his duties as a ninja. Many of his supports show that he often goes on solo recon missions and that he has high confidence in himself when it comes to spying and escaping. In his supports with Hisame, he reveals that ninja are not allowed to form close bonds with others, so that even if they die in the line of duty the rest of the army would be unaffected by their death. They are also not allowed to let their faces be well-known, otherwise they would be unable to carry out undercover missions.

In the localized version, similarly to his Awakening counterpart, Asugi gives nicknames to other characters, which often describe their personalities or is out of sarcasm. Corrin is "Boss" (after commenting that "Bubbles" didn't quite feel right), Sophie is "Fumbles", Mitama is "Stars", Hisame is "Gramps", Rhajat is "Sunshine", Ignatius is "Fraidycat", Female Kana is "Little Miss Dragon", Midori is "Doc", and Dwyer is "Naps".

In his supports with Male Corrin, Saizo, and Soleil, it is revealed that like his father and paternal uncle, Asugi is very popular with girls due to his generous nature with his sweets. However, his true intention behind his generosity is information gathering, which he calls his own version of "sweet-talking". Soleil points out, however, that the real reason behind his popularity is because the girls can tell that he is a genuinely kind person. When getting a S Rank with Midori they will be listed as companions in the English version unlike the Japanese version due to them being cousins.

He smells the best out of everyone in the army. His birthday is January 1.