It is good to be kind to people, but Tanjiro often shows sympathy toward demons and hesitates to attack them, which results in him being taken advantage of, both psychologically and physically.
Fans of Demon Slayer know that Tanjiro has a really hard forehead. Headbutting people a lot makes his forehead a surprise weapon of sorts. Tanjiro's forehead seems genetic. The trait comes from Tanjiro's mother, so he has another part of her in him.
As a result of his keen nose, Tanjiro can quickly assess the situation and recognize threats. While it is certainly a unique power that could've been used for comedic effect. Tanjiro became the village detective because of his keen sense of smell, which helped him identify anyone who had gone missing.
Tanjiro's demon mark was awakened for the first time after being attacked by the Upper Moon Six demon named Gyutaro. It has been proven that this mark has increased his speed, strength, and agility tenfold, allowing him to defeat powerful monsters he would not otherwise be able to defeat.
Taniyoshi's ancestor Sumiyoshi looked remarkably like him. Like Tanjiro, Sumiyoshi was a coal seller. Tanjiro knows about him from a memory that he inherited. In this memory, Sumiyoshi is seen meeting the legendary Yoriichi Tsugikuni, the Sun Breathing User.
Several countries, such as China and South Korea, ban these earrings. This is because the symbol of the Rising Sun is associated with the atrocities committed by the Japanese during World War II. As a result, Tanjiro's earrings feature the Sun Disc flag symbol.
Tanjiro is known for showing mercy to almost every living creature. The first person to bring out his full rage is Muzan, the Demon King. Despite Tanjiro's calm and collected nature most of the time, he was in full rage when he encountered the Demon King. He swears to cut off the demon's head.
Tanjiro falls into a coma after his battle with Daki. It is during this time, while he is in a comatose state for two months, that he dreams of his ancestor meeting the Sun Breathing User. While in this state, Kanao is the one who looks after Tanjiro along with a Kakushi named Goto.
Tanjiro's family used to deal in charcoal. His background is permanently etched into his name. The first kanji for his name, "tan", is the Japanese world for charcoal. This is paired up with the other two kanji in his name, "ji" (to heal) and "ro" (son).
After Tanjiro manages to defeat Muzan in an epic battle, Muzan transfers all his emotions into Tanjiro and turns him into a Demon King. Now since he has lost his humanity, Tanjiro starts blindly attacking Demon Slayers around him. However, a flashback helps him in regaining control of his human side.