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I'll kick it of with Milton's Paradise Lost (end of Book 5; beginning of Book 6):
Abdiel the angel, initially joining Satan's revolt repents, repents and withstands Satan, and joins God's army.
Strictly speaking, that's heretical, because the angels could not repent, but this is epic poetry, and the example reminds me of Lefebvre, Williamson, and Vigano:
O alienate from God, O spirit accurst,
Forsak'n of all good; I see thy fall
Determind, and thy hapless crew involv'd
In this perfidious fraud, contagion spred
Both of thy crime and punishment: henceforth
No more be troubl'd how to quit the yoke
Of Gods Messiah; those indulgent Laws
Will not now be voutsaf't, other Decrees
Against thee are gon forth without recall;
That Golden Scepter which thou didst reject
Is now an Iron Rod to bruise and breake
Thy disobedience. Well thou didst advise,
Yet not for thy advise or threats I fly
These wicked Tents devoted, least the wrauth
Impendent, raging into sudden flame
Distinguish not: for soon expect to feel
His Thunder on thy head, devouring fire.
Then who created thee lamenting learne,
When who can uncreate thee thou shalt know.
So spake the Seraph Abdiel faithful found,
Among the faithless, faithful only hee;
Among innumerable false, unmov'd,
Unshak'n, unseduc'd, unterrifi'd
His Loyaltie he kept, his Love, his Zeale;
Nor number, nor example with him wrought
To swerve from truth, or change his constant mind
Though single.
From amidst them forth he passd,
Long way through hostile scorn, which he susteind
Superior, nor of violence fear'd aught;
And with retorted scorn his back he turn'd
On those proud Towrs to swift destruction doom'd.
ALL night the dreadless Angel unpursu'd
Through Heav'ns wide Champain held his way, till Morn,
Wak't by the circling Hours, with rosie hand
Unbarr'd the gates of Light.
There is a Cave
Within the Mount of God, fast by his Throne,
Where light and darkness in perpetual round
Lodge and dislodge by turns, which makes through Heav'n
Grateful vicissitude, like Day and Night;
Light issues forth, and at the other dore
Obsequious darkness enters, till her houre
To veile the Heav'n, though darkness there might well
Seem twilight here;
and now went forth the Morn
Such as in highest Heav'n, arrayd in Gold
Empyreal, from before her vanisht Night,
Shot through with orient Beams: when all the Plain
Coverd with thick embatteld Squadrons bright,
Chariots and flaming Armes, and fierie Steeds
Reflecting blaze on blaze, first met his view:
Warr he perceav'd, warr in procinct, and found
Already known what he for news had thought
To have reported: gladly then he mixt
Among those friendly Powers who him receav'd
With joy and acclamations loud, that one
That of so many Myriads fall'n, yet one
Returnd not lost: On to the sacred hill
They led him high applauded, and present
Before the seat supream; from whence a voice
From midst a Golden Cloud thus milde was heard.
Servant of God, well done, well hast thou fought
The better fight, who single hast maintaind
Against revolted multitudes the Cause
Of Truth, in word mightier then they in Armes ;
And for the testimonie of Truth hast born
Universal reproach, far worse to beare
Then violence: for this was all thy care
To stand approv'd in sight of God, though Worlds
Judg'd thee perverse:
the easier conquest now
Remains thee, aided by this host of friends,
Back on thy foes more glorious to return
Then scornd thou didst depart, and to subdue
By force, who reason for thir Law refuse,
Right reason for thir Law, and for thir King
Messiah, who by right of merit Reigns.
Go Michael of Celestial Armies Prince,
And thou in Military prowess next
Gabriel, lead forth to Battel these my Sons
Invincible, lead forth my armed Saints
By Thousands and by Millions rang'd for fight;
Equal in number to that Godless crew
Rebellious, them with Fire and hostile Arms
Fearless assault, and to the brow of Heav'n
Pursuing drive them out from God and bliss,
Into thir place of punishment, the Gulf
Of Tartarus, which ready opens wide
His fiery Chaos to receave thir fall.