Shinjuro Rengoku is the father of Kyojuro Rengoku and Senjuro Rengoku and the husband of Ruka Rengoku. He formerly served as the Flame Hashira of the Demon Slayer Corps.
Shinjuro strongly resembles his sons, Kyojuro Rengoku and Senjuro Rengoku, possessing unruly orange hair that flares out around his face, becoming redder near the ends above his ears, that he wears messily tied back behind his head. He has fair skin, bushy black eyebrows and bright, orange eyes that redden near the pupils, that are slanted inwards and shaped so as to give him a furious appearance.
Shinjuro wears a traditional kimono robe. When he was the Flame Hashira, he also wore the haori with flame-like ridges at the end that Kyojuro wore when he was the Flame Hashira. In the Infinity Castle Arc, he is shown with a katana with a flame guard similar to Kyojuro’s, with what appears to be a flame pattern on the sheath.
Shinjuro is a very short-tempered man, especially when regarding the Demon Slayer Corps and his son, Kyojuro, with the mention of either causing him to grow furious. He appears to be abusive, harshly insulting the recently deceased Kyojuro and knocking Senjuro to the ground during his fight with Tanjiro. He is also an alcoholic – his first action upon awaking after being knocked out by Tanjiro is to buy alcohol, and he is often seen drinking with sake.
Shinjuro possesses feelings of inferiority, which stemmed from reading the chronicles of the past Flame Hashira, where Sun Breathing is described as the original and most powerful breathing style. He mocked the other styles as “cheap imitations” of Sun Breathing and accused Tanjiro of coming to their residence to mock them for his superiority, after recognising his Hanafuda earrings.
However, it is later revealed that Shinjuro truly cared for Kyojuro despite what he said to Tanjiro, and the memory of Kyojuro causes Shinjuro to begin breaking down in tears.
He later defends Kiriya and the rest of the Ubuyashiki Family with Tengen Uzui and vows to follow Kyojuro’s example and not to bring shame to the Rengoku family.
After his wife’s passing, Shinjuro began drinking while doing duties as a Hashira and eventually encountered Hairo who he, in a drunken rage, proceeded to cut various parts of his body without ever cutting his head whilst lamenting on why his wife had to die yet Hairo, a demon, managed to survive and that he sees that all the things he’s done as utterly pointless and proceeded to tell Hairo that he was a coward despite being a demon and questions him if he really wants to keep escaping like a coward until he dies.
He once saved a young woman and her daughter from being harmed by a demon, using Flame Breathing, First Form: Unknowing Fire. That woman would remember his actions once more when she and her granddaughter was saved again by Kyojuro.
Shinjuro saved a young Obanai Iguro from the Serpent Demon and reunited him with his cousin. Nonetheless, due to his cousin’s attitude, Shinjuro had to separate them.
Before retiring as the Flame Hashira, Shinjuro tore apart the Generational Flame Hashira Record of the Rengoku family.
Due to his status as the former Flame Hashira of the Demon Slayer Corps, it can be assumed that Shinjuro is an extremely powerful swordsman. In a brief fight, he was able to completely overwhelm Tanjiro in hand-to-hand, but was eventually knocked out with a powerful headbutt. He was noted by Tanjiro to not “move like an average person”, hinting to his above average physical abilities as a trained/seasoned demon slayer.
Flame Breathing: One of the core Breathing Styles, this style ran in the Rengoku family since the invention of Breathing Styles and is passed eventually passed down to his son, Kyojuro.
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