It’s not about Hei-Hei.
A color lot, like orange, gives the brain one thing to latch onto. It has one opportunity for success.
A character like Gamora has sooooooo many. It has Guardians, green thing, woman, Gamora, etc. If someone asked you to remember a color or word, that’s the chance you remember it 12 hours later? 90%?
If this helps people find their car 10% faster, that’s a win.
The silhouette, colors, and visual design are all very distinct. Hei-Hei is green, and a chicken, in addition to any design they have.
I can name every country in the world on a map, identify every flag, capital, a major geographic features. I’m not the norm, I’m the exception.
The average American can probably identify those three flags, but good design requires no prior knowledge. Good design require knowing nothing. Good design isn’t built for the 90%, it’s for the 10% of fringe situations where things go wrong.
Anyone can make a bridge with enough time and budget. Takes an engineer to do it fast, efficiently, and for it to last the test of time.
A country flag, or a symbol associated with the country, like the Tower of London, Eiffel Tower, or leaning tower of Pisa, all require prior knowledge.