I quite often get PCs I’ve played a lot doing that, but NPCs are rarer.
I did have a related experience in a cyberpunk game at a Stabcon a few years ago. I got invited into it by some people I barely knew, and since the system being used was unfamiliar, and the setting was a future Japan that was going militaristic and authoritarian, I decided to create a PC whose objectives were to end up at the top of that via politics. Using the Hitler (1925-33) playbook worked horrifyingly well: at the end of the session, I’d ended up as the leader of a clique that was controlling Japan, without the players or GM realising who I was basing the character on. They wanted me to carry on with the campaign, but I wasn’t going to play that character again.