For all the claims of sexism in games showing off girls butts is less common than you'd imagine. 2b, Bayonetta, Stellar Blade Eve are the obvious choices but probably some girl in King of Fighters or Street Fighter gives a lot more fan service. Harley Quinn in Arkham Knight with the DLC. Samus Aran in her zero suit artwork, not so much in the game. I personally like Panam in Cyberpunk 2077. Not that they show off her assets much, but when you first meet her she's bent over a car like Megan Fox in Transformers.