Underworld emperors and brokers : Neutral, they sell weapons and illegal goods for everyone, be it pirates or governments. unless the revolutionaries threat their operations, like when Sabo caused havoc on Dressrosa and Doflamingo placed a bounty on his head.
Kaido and Big Mom : Neutral under most circumstances. only hostile if the revolutionaries threat their territories/interests and vice versa.
Shanks : Neutral under most circumstances. could be hostile if Shanks' visit to Mary Geoise indicates that he wants to protect the balance between the Great Powers. could be friendly if Shanks is just deceiving the world government.
Blackbeard : Hostile. the revolutionaries stole the Mera Mera no Mi and took down one of the 10 Titanic Captains, in return Blackbeard Pirates obliterated Baltigo and stole the weapons stocked there. so they're basically engaged in a war. Kuzan might even be an agent working for the revolutionaries.
Luffy : Friendly of course thanks to his relationship with Sabo and being the son of Dragon
Germa 66 : They operated in North Blue which has a North RA army as well, don't know if they ever clashed. should be Hostile before betraying the world government after their "alliance" with Big Mom. currently they are independent from the government, in the near future they could ally with Dragon.
Kidd : Probably Neutral or Friendly. he expressed his disdain towards the world nobles. judging by his hot headed personality though, i don't think he adores anyone after the recent betrayal of Apoo/Hawkins.