In my attempt to rush out the post, I probably overgeneralized what a Gestalt was. I almost want to take back saying the One Ring of Lord of the Rings is Gestalt, at least in the sense that a ring is a ring, and by itself, is not very unique. We'd be getting closer to Gestalt if we could sum up what the ring does that makes it unique, such as "A ring which grants unlimited power to those powerful enough to wield it" (or something).

In your first idea, the Gestalt is most definitely the vine coming from the eye. It was the first visual you described, and it is most certainly vivid and unique. You say someone has a vine growing out of their right eye and everyone can imagine it, and I, for one, can think of no other example of that image.

Think of the Gestalt as something visual (though not necessarily a noun), which can be fairly summarized in a sentence or less. The vine in the eye was perfect. What can you say for the other three examples that can have such an instant impact as the vine-eye?

As for characters being Gestalts themselves, it's certainly possible. If they're visually unique in some fashion, as to be instantly recognizable, then they certainly can be. The Gestalt of practically any superhero comic is the superhero, since their costumes are outlandish and spectacular. The Gestalt character of the original Star Wars trilogy is probably Darth Vader: his design was meant to be akin to a futuristic Samurai outfit, which is something not seen elsewhere.

Do any of your characters from those last worlds have at least one unique feature about them, such that if you drew them, a viewer would be interested to know more about them?