Kaido
VS
Luffy (main character) zoro 6 scabards + izo (wano hero)
Big Mom
VS
Marco (met BM outside) Jinbe (help marco friend) nicorobin (help jimbe) sanji (big mom arc revenge & help robin) kid (want to kill yonko) killer (help kid) law (help jinbe and SH)
King
VS zoro
Queen
VS kid
Jack
VS neko & inu
Perospero
VS sanji
Who's who
VS xdrake
Sasaki
VS killer
Black maria
VS yamato
Ulti
VS nami carrot shinobu trio
Page one
VS Franky Brook usopp chopper
Apoo
VS Hawkins
Fukurokuju
VS hyogoro
Hotei
VS yakuza leaders
Since yamato & x drake switch side (not sure about hawkins)..
Seems all the characters to do the war & fights already there now..
I don't see BM and BMP playing a major role in this war unless at the end of the arc.
Luffy will give Kaido the finisher.
If Zoro fights a Calamity he won't be joining against Kaido.
Sanji definetly fighting a Calamity.
Jinbei very possible to face a Calamity but less likely.
Luffy could fight Jack at the top but I hope not. Kaido is more than enough for our MC.
Kidd and Law definetly facing against Kaido.
Killer maybe against Apoo or an F6 member. Unlikely to join against Kaido.
Hawkins may end up switching sides.
Marco and Perospero(wanting the BMP out of the alliance with the BP) will stall BM.