Deuteragonist: the second most important character in a narrative, positioned immediately after the protagonist in significance.
GOAT: Price (Cod 4), Soap (Mw2), Gideon (AW)
GREAT: Reznov (WAW), Hudson (BO1), Adler (CW)
SOLID: Harper (BO2), Marshall (BO6), Price (MW19), Ghost (MWII)
BORING: Yuri (MW3), Salter (IW), Soap (MWIII)
BAD: Hesh (Ghosts), Zussman (WWII)
HORRID: Hendricks (BO3)
Note, didn’t include BO4 cause no campaign, and both VG and BO7 had a large cast of main protagonists rather than a protagonist then deuteragonist.