Yuichiro Tokito

Yuichiro Tokito was the older twin brother of the Demon Slayer and Mist Hashira, Muichiro Tokito.

Appearance
Yuichiro was a short young boy with long, straight hair of a dark black color that fades to pale turquoise the closer to his waist it goes. He wore it loose with two clumps protruding slightly from each side of his head, a set of marginally shorter hair left down to frame his face, and unruly bangs over his forehead. He also possessed large, pale turquoise eyes, a trait, like his hair, that he shared with his twin brother, Muichiro Tokito.

He wore a dark, sleeveless yukata with a white mist design, similar to the lighter one his brother wore when they were both 10.

Personality
Yuichiro was a cold and skeptical individual who didn't believe in compassion or caring for others. He believed that doing good deeds wouldn't do a person a shred of good, which is seen when he claimed his father was a fool for dying while trying to gather herbs to help cure his mother's fatal illness, and shot down Muichiro's suggestion that they become Demon Slayers in order to save people's lives. This behavior likely originated from the pain and grief of losing both of his parents in one fell swoop, however, since just before he passed away from a Demon attack, Yuichiro was seen praying that his brother be saved and apologizing for getting in his way when he wanted to be useful, suggesting that deep down he was actually a kind and caring person.

Yuichiro's critical attitude to the altruism his parents' selflessness and their good intentions to help others while neglecting their own limitations is not entirely true. It was something that Yuichiro likely spoke to his brother out of fear that the same fate would befall him. However, when Yuichiro jumps in front of his brother to protect him, it becomes clear that he is more similar to his family than he imagined.

Later, upon Muichiro's own death and their reunion in the afterlife, Yuichiro is shown angrily and tearfully telling his brother to return back to the land of the living, lashing out at him for putting his life in danger and as a consequence dying at such a young age. He showed Muichiro that his rough, blunt and sometimes cruel personality was due to him trying to protect and look after his younger brother in his own way since he truly loved him.

History
Yuichiro and his younger twin brother, Muichiro, were born to a woodcutter and his wife. When they were 10, their mother caught a cold which developed into bronchitis and killed her. Their father, away at the time, went to fetch medicinal herbs during a storm and ended up falling off a cliff to his death. The two siblings survived together, though while Muichiro took after the emotive and kind nature of their father, Yuichiro instead held a cold and impassive outlook on life.

In the following spring, Kagaya Ubuyashiki's wife, Amane Ubuyashiki, arrived to recruit them for the Demon Slayer Corps, informing them that they were descendants of powerful Demon Slayers. Muichiro's excitement was opposed by Yuichiro's unwelcoming and rejecting reception, eventually forcing Amane to leave them. Annoyed by Muichiro's continual optimism, Yuichiro lashed out at him in an emotional outburst and revealed that he blamed the death of their parents on their hardworking and selfless nature and adopted a cold outlook, hoping to keep himself and his brother alive. Though Amane continued to visit the twins, Yuichiro chased her away each time, eventually leaving for good when he threw water on her. In the following summer, a demon arrived at their cabin during the night and attacked them; Yuichiro lost his left arm while trying to protect Muichiro by standing between him and the monster. As the demon insulted them for their worthlessness, Muichiro lost himself in a rage and defeated the demon with all the tools at their disposal and wooden logs.

By sunrise, the demon withered into ash and Muichiro dragged himself back to the house. There, he found Yuichiro near death praying to the heavens that his brother might survive. Yuichiro then told Muichiro that the 'Mu' in his name means infinity, and told him to live on. He then laid there grasping his brother's hand as he died.Several days later, Amane and her daughters Nichika and Hinaki found the twins; though Yuichiro's body had already began to rot, the still-living Muichiro was saved.

Swordsmith Village Arc
Throughout his time at the Swordsmith Village and spending time with Tanjiro Kamado, Muichiro found himself experiencing familiar events and phrases he have already heard, despite his amnesia, culminating in him remembering his formerly lost past during his battle against Upper Rank Five, Gyokko. After finding himself on the verge of death, the Mist Hashira saw his life flash before him, causing him to reminisces on the events that led to his path now, including Yuichiro's indifference attitude after their parents' deaths and his own demise. The traumatic memories caused mysterious marks to appear on his face, enhancing his physical abilities to a new height and allowing him to battle Gyokko blow-for-blow.

After killing Gyokko, Muichiro succumbed to the demon's poison and collapsed, though he was tended to by the swordsmiths he had saved, Kozo Kanamori and Kotetsu. As he laid on the ground and saw the hilt of his friend Kyojuro Rengoku, Muichiro began to mourn him but saw himself surrounded by visions of his family. Yuichiro held his twin's hand and commended him on his hard work, bringing the Hashira to tears.

Trivia

 * Yuichiro's surname contains the kanji for "time"(時 toki) and "transparent, permeate"(透 to), while his given name contains the kanji for "existence"(有 yu), "one"(一 ichi) and "son"(郎 ro).
 * The meaning of first kanji of Yuichiro's name, "existence" stands in stark opposition to the first kanji of his brother Muichiro's name, as that kanji means "nothingness".
 * In addition to both being born twins, Yoriichi and Yuichiro share the initial Y in their name. Coincidentally, his younger twin brother Muichiro shares the initial M with Yoriichi older twin brother, Michikatsu. It is unknown whether this is just a coincidence or a common naming tradition for twins born into the family.
 * Yuichiro also shared his Japanese voice actor as his twin, but with some variations in tone of voice.
 * In the alternate universe of Kimetsu Academy, where Yuichiro is alive, it is mentioned that the Tokito twins, who are popular among the girls, are prodigies. This implied that Yuichiro had the same potential as his brother to become a talented Pillar if he wanted to do so.

Quotes

 * (To Muichiro Tokito) "What could you do?! You can't even boil rice by yourself! But you're gonna be a swordsman and help people?! Quit talking nonsense! You really are exactly like father and mother! You're a dreamer! What's wrong with your head?! Like mother, who didn't say she was sick and kept on working until it ruined her health! And father who went out to gather herbs in a storm despite how much I tried to stop him! Despite all the times I told mother to rest! Helping people is something only certain people can do! We're just kids! Even if our ancestors were swordsmen, what can we do?"
 * (To Muichiro Tokito about their parents) "You can't trust the word of a man who died trying to do something for someone else. In mother's condition, herbs weren't going to cure her. It was completely foolish. If he hadn't gone out in that storm, only mother would have died. I'm just telling the truth. The "Mu" in "Muichiro" is "Moo"... like a big dumb cow. And this conversation is pointless. Nothing can change the past."

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Yuichiro Tokito Tokitou Yuichirou Юичиро Токито 時透有一郎 時透有一郎