Seitan is meant to be quite nice, it's made from gluten

Mushrooms, nuts and seeds is what I can still think of.

Lots of vegans do enjoy nutritional yeast. You don't typically eat a huge amount of it, but it is around 50% protein.

There's nut butters which can be used quite nicely in cooking. Unfortunately, they do tend to be rather expensive.

Chia seeds are also perhaps worth highlighting. If you soak them in water for long enough, they basically turn into pudding (as in, "chia pudding" is an actual dish). Well, and they also have a fairly neutral taste, so that gives them lots of flexibility in cooking, baking, cereal etc..

Well, in the face of a Wikipedia article that supports your personal belief, of course I’m incorrect. But to anyone with a rational brain, i’m as confidently accurate is it gets.

People overindulge on overexamining, and this is the result.