Why does Tanjiro's scar change?

Tanjiro's scar changes throughout the Demon Slayer series, and this change is a key aspect of his character development and the story's deeper connections to the Sun Breathing technique. Here's a breakdown of why and how Tanjiro's scar changes:

1. The Initial Scar:

At the start of the series, Tanjiro has a burn-like scar on his forehead. This scar was not from a battle but from a childhood injury. As a child, Tanjiro had fallen while trying to help his family, which led to a burn on his forehead. This scar is not immediately significant, but it is a notable part of his appearance.

2. The Change of the Scar During the Battle with Rui (Lower Moon 5):

During Tanjiro’s battle with Rui, a member of the Twelve Kizuki (Muzan's demon followers), the scar on Tanjiro’s forehead changes dramatically. Tanjiro’s scar transforms into a more prominent, angular shape, resembling a flame-like pattern. This change in the scar happens when Tanjiro is using the Hinokami Kagura, the Sun Breathing technique, which he unknowingly inherited from his father. The pattern of the scar changes as he accesses the ancient powers of the Sun Breathing, marking his connection to this powerful technique.

3. The Sun Breathing Connection:

As the series progresses, it is revealed that Tanjiro's family had a connection to the Sun Breathing technique, and the scar changing is symbolic of Tanjiro awakening to his true potential as a Sun Breathing user. The scar is not just a physical mark; it represents Tanjiro’s ancestral connection to the ancient, powerful breathing technique used by the first Demon Slayers.

• The Flame-shaped Scar: The shape of Tanjiro’s scar is closely tied to the sun, which is the source of all life and the ultimate weapon against demons, especially Muzan. When Tanjiro’s scar changes, it signals that he is starting to unlock the hidden power of Sun Breathing. This is why the scar transforms into a symbol that reflects this power.

4. The Final Change During the Battle with Muzan:

In the final battle with Muzan, the scar on Tanjiro’s forehead continues to evolve. The scar becomes even more prominent, taking on a more distinct and defined shape. This change happens as Tanjiro becomes stronger in his usage of Sun Breathing, especially when he is in a near-death state or when pushing his abilities to their limits.

The scar transformation represents Tanjiro’s growth as a warrior and his ability to harness the true power of the Hinokami Kagura. It also serves as a visual cue that Tanjiro is coming into his own, becoming a more formidable threat to Muzan and the demons.

5. The Scar's Symbolism:

The scar changing also symbolizes Tanjiro's inheritance of his family’s legacy and his journey of self-discovery. The connection between his scar and the Sun Breathing technique is not just about physical power but about carrying forward his family's heritage. The scar is a reminder of Tanjiro's resolve to defeat Muzan and end the demon curse.

Conclusion:

Tanjiro's scar changes as he grows in strength, particularly in connection with the Sun Breathing technique and his fight against the demons. The transformation of the scar is a key visual element that marks his evolution from a simple charcoal seller to a powerful Demon Slayer, and it plays a symbolic role in his battle to end Muzan’s reign and save his sister Nezuko. The scar’s change represents Tanjiro’s connection to his ancestors and the ultimate power of the sun, which is the only thing capable of destroying demons.