Basic Trope: Someone who openly cooperates with and emulates the enemy forces that have conquered or occupied his/her homeland, and seeks to curry their favour.
Straight: After The Empire conquers his hometown, Quincy becomes the most pro-Imperial person in town. He openly adopts Imperial customs and decides to run for mayor to help The Empire consolidate their control of said hometown, rather than joining La Résistance.
The moment that Emperor Evulz' forces even hint at wanting to invade his hometown, Quincy goes out of his way to help them take over and works to ensure they stay in power.
Quincy keeps fighting for Emperor Evulz, even when his forces are obviously going to lose.
Downplayed: He helps defend the town at first, but once the fight is lost Quincy is the first to preach peaceful collaboration for the sake of peace.
Quincy feels his country simply isn't strong enough to oppose the Empire, and would rather adjust to the new status quo than risk everything he has left with useless defiance.
Quincy stands to gain more serving in the Empire's new regime than he does under the current one... or at least, that's what he believes.
Quincy ideologically believes that The Empire is superior to the old regime.
Inverted: Ycniuq, one of the Empire's soldiers, decides to cooperate with La Résistance/the heroes.
Subverted: Quincy appears to be placidly accepting the Empire's rule, but is actually secretly supportingLa Résistance and just puts on a show of supporting the Empire.
Lampshaded: "There's always one guy who really goes the extra mile in showing cooperation with the invaders, isn't there?"
Invoked: The Empire picks locals sympathetic to them to become regional governors of conquered territories, since locals would (theoretically) hold stronger sway over the native-born population.
Exploited: Denise, a savvy trader from a third nation who has had good dealings with the Empire but has constantly been rebuffed by Quincy's homeland, successfully argues that now that the Empire runs Quincy's country, she deserves similar treatment from the new government.
Defied: Quincy, while tempted, refuses to cooperate with the invaders in ANY way.
Michael: Emperor Evulz has declared war on our country. As a proud soldier of Tropendom, I would be particularly affronted if someone were to hasten our defeat by aiding and abetting the enemy.
Conversed: "Boy, that Quincy was certainly cast directly into the role of Benedict Arnold."
Implied: Quincy was purportedly on a trip in yet another country; he comes home just after The Empire takes over, and is suspiciously sanguine about how his family will be treated.
Deconstructed: Quincy betrayed his homeland and espoused Imperial values because The Empire is a genuinely better alternative than what they had before; in his home country the state religion practiced human sacrifice, had vast amounts of Fantastic Racism, orphans starving in the streets, horrible ecological degradation, and the insane king is running things into the ground. While not perfect, at least other conquered countries weren't as messed up as his own.
Reconstructed: However, The Empire turns out to be even worse: Their 'superiority' was lies and propaganda. Quincy keeps on helping them and espousing their values anyway.
Played For Laughs: Quincy has premade signs with "I ♥ _____" ready and waiting to be filled out and hung at a moment's notice.
Played For Drama:
After the Empire takes over, Rachel starts organizing a secret resistance movement... unaware that her trusted friend Quincy has chosen to side with the occupying forces, and will likely betray her if he learns about her plans.