I've always thought the push-pull with Yugi and Yami is less about two guys sharing a body and more about how we decide who gets to be the 'real' person. Like, early on, Yami's the dominant one, no question, saving Yugi every duel. But then the series spends so much time proving Yugi's strength isn't just borrowed magic; it's his heart and his weird, stubborn puzzle-solving brain. The conflict isn't really resolved by one absorbing the other, but by them finally understanding they were two halves of the same soul all along, which is a way smoother take on identity than most stories manage.
What gets me is how the Pharaoh's memories and Yugi's present are constantly crashing into each other. Yami doesn't know who he is, and Yugi's living with this ancient, powerful ghost who kinda is him, but also isn't. It makes the Shadow Games hit different—they're not just card battles, they're Yami trying to brute-force his past into existence, using Yugi's friends and life as the stakes. That's heavy. And Yugi's journey to accepting that, and even fighting for Yami's right to remember, to be whole, even if it means letting him go... man. It reframes the whole 'possession' thing as a shared burden, a mutual rescue mission.
I reread the manga recently and it's wild how much the art sells it too. The way Takahashi draws their expressions shifting, one panel Yugi's determined look, next panel it's Yami's smirk on the same face. You feel that internal switch. The Ceremonial Duel isn't a fight to see who's stronger; it's the last conversation they needed to have to become complete people separately. The empty Millennium Puzzle at the end says everything.