What if tanjiro got the carnage symbiote?

The finale

Five years later

Nezuko kamado woke up and began making breakfast for her family.As she does the last member of the kamado family knocks on her door.She runs to the door excitedly and opens it to see the leader of Japan,the judge,jury,and executioner.The leader of the new age of life. The uniter of demonkind and humankind.

(Credits to the artist,I can't find who the artist is)

Tanjiro Komado.
Tanjiro:Hey Nezuko.
Nezuko:Brother!
Nezuko tightly hugs Tanjiro and welcomes him in.Their smaller siblings come out as they swarm Tanjiro.
Tanjiro:Hey guys!
Kie kamado steps out as well.The kamado family sits down and enjoys breakfast.
Kie:How was work honey?
Tanjiro:It was fun,got to see inosuke's kids yesterday,so that was nice.
Kie:Ah.Say,is that a new sword?
Tanjiro:Oh this?This is Rengoku's sword.I wanted to try it out so he lent it to me for the week.
Kie:That was nice of him,make sure to take good care of it.
Tanjiro:Of course.How's Zenitsu been treating you Nezuko?
Nezuko:He's been great!He always makes me smiles and laugh and takes us seriously.
Tanjiro:That certainly sounds like Zenitsu.
Nezuko:Tell me tanjiro,how is your wife?
Tanjiro:She is amazing.She's a lot like a mother,she's caring,she's sweet and pampers me like a child sometimes,she is always looking out for me.
Nezuko:That's so nice.
The family finishes their food as Tanjiro softly wrestles with some of the younger siblings. Tanjiro eventually leaves the house and heads off to work.He goes to his region of Japan.

Asakusa,the main base of operations.As Tanjiro looks across the beautiful city,a large and bulky demon lands on the side of the building tanjiro stands on.Tanjiro and the bulky demon slide down the building and land on a roof.Tanjiro turns to face no ordinary follower,but the general of his army.