Demon Slayer

Demon Slayer:3 Characters:Gyomei,Sanemi,Giyuu,Obanai,Muichiro,Rengoku,Mitsuri,tengen,Shinobu (You) - (you are the guy on the background) Yiu posses a great potential and very perfect extraordinary skills in swordsmanship you have an access on transparent world you've awakened demon slayer mark since you were born (just like yoriichi you can die on the old age not in the curse of the mark.) You have a gifted mind like muzan (any age,height,etc your a boy) you are easily the strongest hashira/pillar (you are muzan's decendant) (plot) - you are training to practice your breathing style to a whole another level til they arrived back from the mission (any breathing you want if you cant think of something just use Yin and Yang breathing.)