I don't own any of the Demon Slayer Characters.
1. Tanjiro was born with DEMON SLAYER MARK.
2. Tanjiro is way more robust than the HASHIRAS before Final Selection.
3. Nezuko didn't get turned into a Demon instead, she became a Demon slayer with trai...
So at the beginning of the chapter Tanjiro has the power level of INFINITY CASTLE ARC, and his Demon Slayer Mark looks like this.
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Tanjiro looks like that at the age of 13. As mentioned Tanjiro wears a GREEN and BLACK CHECKERS COMBINATION "KOMONO", but here he wears RED KIMONO like Yoriichi. Because his father gave this colored KIMONO to match his MARK.
Tanjiro is naturally STRONG like Muichiro. He has the same personality as in canon. Even without training, he can kill the lower moons easily and on par with the upper moon 6. In the beginning, Tanjiro is not OP, but as he progresses further he will surpass everyone with his skills and Quick Decision making.
From Tanjiro all the Demon Slayer Corps members learn about SUN BREATHING and the ORIGINATION OF ALL BREATHING STYLES. And how Muzan was almost killed by that.
