A geneticist who builds species, decides they are failures, and destroys them, which he considers a form of ambition.
The High Evolutionary is an alien geneticist who set out to take what he considered lower life forms and improve them into a perfect species. He is played by Chukwudi Iwuji as a man with no charm at all, which is deliberate and correct.
He is the most upsetting antagonist in this catalogue, and the reason is that his crimes are procedural. He does not conquer anything. He runs a laboratory, files results, and incinerates whole populations when the results disappoint him. Vol. 3 is a film about a talking raccoon and it is the closest the Marvel films have come to a horror film about animal testing.
Minor spoiler
Rocket is one of his experiments. The flashbacks in Vol. 3 show the cage, the friends and what happened to them, and the film is careful that the High Evolutionary never once sees any of it as cruelty. When his own creations turn on him he is simply annoyed.