Well, regarding waifus, I would use that power to travel fictional verses and have fun and while doing that, imma naturally aim to have a girlfriend or marry someone there. For example, If I got Re:Zero, I would plan to marry both Emilia and Rem. If I go to My Hero Academia, imma plan to have a relationship with Fuyumi Todoroki. Of course, in some verses, I can't get every waifu (like in MHA) but I would be satisfied. However, I might create a fantasy isekai world and plan to have a harem there. In other words, imma have a waifu or multiple in each world I create and adventure. Of course, there could be some worlds that I won't marry or have any waifu in (depends on how I choose to live in each one).