Not including movie members or anime feats:
Pirate cast:
Roger: Oneshotted Oden casually.
Rayleigh: >Kizaru, and >= Blackbeard.
Scopper Gaban: fought in the Edd War, was willing to fight Oden alongside Rayleigh, I would estimate him to be >Old Rayleigh.
Crocus: At least Initial Kenbun, can tranquilize people, Old Crocus is at least >East Blue people.
Kozuki Oden: >= Zoan Kaidou.
Shanks: >Bigger Mom
Buggy: Can't be cut by anyone without Haki.
Inuarashi and Nekomamushi: Roughly comparable to Jack, stronger in Sulong forms.
Toki: Not especially strong, but has mad hax.
Not sure if we include Momonosuke, but if we do, he could do
some damage to Kaidou.
Primebeard: essentially equivalent to Roger
Marco: >Admirals, generally.
Ace: Admiral-tier.
Jozu: Essentially on par with Aokiji.
Thatch: Considered one of the strongest in the crew.
Vista: Held his own against Mihawk
Blamenco: >Squard
Rakuyo: Was uninjured after a brief confrontation with Kizaru
Namur: >Squard, higher underwater
Blenheim: >Squard, carried Jozu around
Curiel: Survived a punch from Akainu
Kingdew: >Squard
Haruta: >Squard
Atmos: >Squard
Speed Jiru: >Squard
Fossa: >Squard
Izou: >Guernica, even while injured, only dying to Maha because he was already bleeding out and stuff.
Teach: Is literally Blackbeard, IDK what you want.
Squard: Was able to impale a casual Sickbeard. Potentially stronger than Little Oars Jr, due to Whitebeard selecting him to lead the other subordinate crews.
Little Oars Jr.: Was basically getting pelted with everything, unharmed by a bunch of Vice Admirals, one of the only attacks that seriously hurt was from ya man Kuma, who is potentially comparable to Sabo.
Marine Cast:
Sengoku: Fought Roger
Garp: Fought Roger
Tsuru: Has crazy hax, >her old self, who fought Jack alongside Fujitora, and terrified Doflamingo.
Akainu: Admiral
Aokiji: Admiral
Kizaru: Admiral
Greenbull: Admiral
Fujitora: Admiral
Momonga: Confident he could fight Hancock, nearly murdered Marineford Luffy with little effort
Onigumo: Pinned and handcuffed Marco(Do not make that dirty) and has dope-ass zoan powers. Was selected to transfer Ace to Marineford.
Lonz: Pretty sure he was stated to be on par with a couple of WB's crew once
Cancer: My favorite one
Tokikake: Admiral Candidate
Gion: Admiral Candidate
Smoker: Logia Hax