I admit I bruteforced my way to 100%, though a LOT of these fusions really gave me those "Aha!" moments with how surprising and clever they were.
I also loved that the game wasn't just a character creation UI, but was a character creation UI on a monitor in a 3D environment that we're seeing in first person, and that we can look around at the sticky notes and the whiteboard and even the fan on the ceiling. It's such an extra amount of polish that of course isn't necessary for gameplay, but it adds so much to the whole vibe of the game.