Man, imagine a game where you get isekai'd halfway through and have to relearn the way you play each time and re-meet characters you care about. Like you play the whole first half on the days leading up to the apochalypse (with time management like persona 5), but you and the characters you knew are reborn in a different world, where you are different races, raised from childhood, you recognize each other from the past life, you go on adventures together, you bond deeper and deeper. The butterfly effect decides who becomes your soulmate as you are ripped appart through world ending events over and over again untill you reach your final forms and face the world eater head on.
I imagine it like Dragon's Dogma, with the pawn system, but instead with established characters that aid you on your journey. And you can grow bonds and fighting styles with specific friends or lovers and reach combos.And each new world is a new perspective, a new art style, with new bodies and new weapons.