Webin tanjiro's journey to being the strongest demon slayer of all, his scar transforms into becoming a demon slayer mark which is fitting his sun breathing. Webtanjiro acquired the scar on his forehead while protecting his younger brother. He got the scar when he tackled his brother out of the way of a falling pot of. Webafter months of hellish training and a gruesome exam, tanjiro joined the demon slayer corps hoping to meet powerful demons that could help him find a way to. Webthe truth about the link between tanjiro’s facial scar and his uncanny ability to overcome stronger demons lies in the demon slayer corps' beginnings. Webone of the things that shinjuro seems certain about is the origin of the breathing styles. In the letter, he reveals to tanjiro that the scar on his head is the. Webafter suffering a blow, right where his scar is located, tanjiro's head was bloodied or bandaged for the next several episodes. However, when he eventually took. Webthe scar on tanjiro’s forehead became a demon slayer mark officially during the entertainment district arc of the anime. While our hero was fighting the upper. Webtanjiro's scar changing shape is something of a visual indication of his progress as a demon slayer. The scar changes as he gains more experience in battle,. Webto answer the question, tanjiro’s scar was actually the result of him saving his brother. This is different from the demon slayer mark which he manifests later.