My favorite trope is when the bad guys find someone completely harmless and innocent and they all go "okay let's protect this cinnamon bun" and you've got like a room full of hardened criminals and a little orphan girl who is just happy she has friends now and everyone ends up redeeming themselves
Bonus when they're not even protecting the innocent from other bad guys and it's just a bunch of thugs helping the morality pet get through mundane life

