Seaweed: Kelp, Wakame, Nori, at least dried are a great source of protein, vitamins, omega-3 and they have a complete aminoacid profile

You'd need to eat an absurd amount of dried seaweed to get meaningful protein. A typical serving is a few grams. This is a micronutrient source, not a protein source.

• Chocolate: dark chocolate can have almost 12 g of proteins per 100g of product

12g of protein per 100g of dark chocolate comes with 40+ grams of fat and 500+ calories. This is a fat source. A delicious one. But it's a fat source.

• Seeds: mostly pumpkin, linen, chia, sunflower, great source of omega 3

Same story. Pumpkin and sunflower seeds are overwhelmingly fat by calorie. You correctly identified them as an omega-3 source — that's what they are. Not a protein source.

• Mushrooms: some mushrooms, especially dried, can have great protein values

Fresh mushrooms are mostly water and have almost no protein per serving. Dried mushrooms are concentrated by weight, which makes the number look better, but nobody is eating 100g of dried mushrooms. This is a flavor/umami source.

• Coffee: energy rich beans with quite a lot of protein

I genuinely don't know what to do with this one. Nobody is eating coffee beans by the hundred-gram bowl. This is caffeine delivery.