My kny MVP list
Let me tell you :--
Kagaya (ultimate mvp even after death)
Tamayo(drug maker) & Shinobu(first to die but one and only hashira to almost solo upper rank + the one to give idea to add the age increasing stage in drug(we got to know in tamayo's memories) )
Yorichhi (due to him and his fight with muzan tamayo got released and kagaya got to know many things about muzan)
Yushiro (broke the masterstroke(nakime) of muzan and literally devoured the infinity castle plan)
Tanjiro (ultimate fight against akaza and muzan especially)
Gyomei (why not)
Sanemi (you need reason bruhh)
Obanai (saved tanjiro many times at the time everyone was about to die )
Genya & Muichiro (the kitkat duo did almost 50-70% work in kokushibo defeat by red blade and bda)
Giyu (below them cause his major stuff was holding akaza, he contributed in muzan fight but not like many others cause he lost many of his strength)
Zenitsu (soled upper rank)
Kanae and Inosuke (completed shinobu masterplan)
Mitsuri (helped in yushiro plan + torn muzan arm bare hand) (they did my girl dirty by making her first Target of muzan 😭)
Other Slayers
Honorable mention :--
Kagaya children
Amane aura farming while dying bro her stare to muzan was enough to tell her aura
Former hashiras
Nezuko (for battling herself to become human again and catalyst of fight and i must say canonically most important character)
Tamayo cat (the injection she sent on neck of the hashiras + tanjiro to let them recover their wounds faster and hold on battlefield more was awesome but at last backbone of making medicine are the two members of suic*de gang)
Murata (the most known weak slayer + tanjiro friend)
Note :-- muichiro can be considered somewhat less mvp than giyu
So rank is :--
Genya
Giyu
Muichiro
(I just wanted to tell kitkat duo meme 😂😅)
Suic*de gang :-- Kagaya, Shinobu, Tamayo