Why is Tanjiro different?

Why is Tanjiro different?
It was originally a scar that he had in an accident when he saved his brother from a falling brazier. In 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 technique.
What is Tanjiro's rank?
Despite being Mizunoto-ranked, his skill with the sword was superior to many of his seniors, even to the point of defeating two Lower Ranked demons.
How did Tanjiro Kamado make up for his family being killed?
- When his entire family except for his sister Nezuko is killed by a demon, Tanjiro is determined to make up for failing to protect the rest of his family by putting his entire life into protecting and saving his sister (who only survived by being turned into a demon herself).
What makes Tanjiro Kamado a good demon slayer?
- His Waterbreathing ability made him as strong as demons. He had several special moves that won plenty of battles for him during his search for Muzan. Tanjiro was also bearing his Demon Slayer Mark, which showed how strong he was.
What kind of uniform does Tanjiro Kamado have?
- For passing, Tanjiro is ranked at the lowest level of the organization and given a uniform, a crow that is used for communication and a chunk of a special metal alloy of his choice (suited to killing demons) that can then be shaped into a new blade.
What was the first arc of Tanjiro Kamado?
- First Mission Arc After passing the Final Selection, Tanjiro Kamado sets off to begins his first mission as a Demon Slayer. He is sent to a neighboring town to investigate the disappearances of young girls, which might involve a demon. He meets a young man named Kazumi, and encounters a the dangerous Swamp Demon responsible for the disappearances.