The only game who's final boss is that Blonde girl... Martha Splatterhead:
In the entire game you are led to believe it's some magnate who's ruling the city behind the curtains, then all of a sudden, when you are about to face him, he gets shot in the back from the other side of the limousine window... by none other than THE FINAL BOSS.
In the Arcade version you kick the ambition out of her system, then go your own way... https://www.youtube.com/watch?v=neMju-AWcPw[in the snes version there's a bit more context: the girl says "sorry i could not control myself" & something like thank you; then the protagonists GTFO]-that game's soundtrack was amazing-