Demon Slayer: Why Tanjiro’s Scar Changes Shape
Warning: Contains SPOILERS for Demon Slayer Seasons 1 & 2 and also Demon Slayer issue #129
Demon Slayer presents a subtle question to viewers in the form of what seems to be a scar on Tanjiro's head, which transforms in season 1 to another mark entirely. Unlike the evolution of Tanjiro's physical abilities — which are routinely explained throughout the series as he embarks on a series of tasks aimed at improving his fighting prowess - Demon Slayer's Tanjiro mark isn't fully addressed. However, it should gain more clarification and importance in the anime's upcoming arcs.
So, how did Tanjiro get his scar? Initially, it's explained as an injury he received as a result of saving his brother from a falling boiling kettle. As such, the fact that his scar changes in episode 4 after being smashed into a tree by the Hand Demon would mean that the mark changes because this incident makes the scar worse — as blood is shown dripping from this spot. But this doesn't make sense either visually or logically. The burn scar wouldn't be changed into a line of scars by Tanjiro's shattered mask, nor would it change in surface area. It also wouldn't make sense for a scar to become further scarred.
Related: How Powerful Is Demon Slayer's Tengen Uzui?
Instead, it's worth considering that Tanjiro's mark was never actually a scar, and instead always a Demon Slayer Mark — something similar to the marks seen on various demons in the series. These are similar in that they denote significant power in those marked with them, although for the demons this power is often gained through means not their own, such as being given any amount of blood from the series' major villain Muzan Kibutsuji. In the show, Tanjiro's father Tanjuro is shown with the
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