An idea.....
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What if.... dove-hybrid!reader who is a ceremonial dove of peace that people release to declare freedom or whatever but really, they're trained to fly back eventually because they're rare to breed.
Something, something, you're up there flying for a few minutes until the crowd moves on, but by the time you return back, the event is pure chaos, maybe a bomb went off or there's open fire. Usually your handler would buzz your tracker to signal you but you can't feel it yet. Your golden cage has been dismantled, handler nowhere to be seen, something, something, someone grabs you and drags you with them, possibly to capture and sell you off.
Something, something, you have the fight of your life, you're using your manicured claws to tear into this man and you're clawing his heart out of his chest, years of built up rage flowing through your veins. Your eyes running red with blood, your white wings tainted.
Something, something, you manage to kill him but you're injured, about to collapse when you're rescued by the 141 and taken to a medic on base.
Something, something, you join the military because now you have an unhealthy thirst for violence. But you're also a sweetheart, very polite and poise and cordial so it's natural if some people on the base have a crush on you...
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Bought to you by the limits of my creativity.