Definition of "antagonist"

our antagonists in these controversies

1594–1597, Richard Hooker, edited by J[ohn] S[penser], Of the Lawes of Ecclesiastical Politie, […], London: […] Will[iam] Stansby [for Matthew Lownes], published 1611, (please specify the page)

Antagonist of Heav’ns Almightie King

1667, John Milton, “Book IX”, in Paradise Lost. […], London: […] [Samuel Simmons], […]; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873,

[H]is eyes vacant—his face haggard—his head drooping, the spectacle of such an antagonist to the vigorous Edward, moved only pity in the few, and ridicule in the many.

1843, Edward Bulwer[-]Lytton, “A King in His City Hopes to Recover His Realm—A Woman in Her Chamber Fears to Forfeit Her Own”, in The Last of the Barons, London; New York, N.Y.: George Routledge and Sons […], book XII (The Battle of Barnet), page 433, column 2

So God forbid I'm seen just as an average human being / I mean, imagine if antagonists lacked any evil scheme

2022, Will Wood (musician) (lyrics and music), “The Main Character”, in In case I make it,, performed by Will Wood