To clear up the Brainiac thing, there are at least 3 versions of Brainiac that have ben canon at various points. No, sorry. Forgot New 52. At least four.
1. OG green skinned Brainiac who is the ancestor of Brainiac 5 from Legion.
2. At the end of the bronze age, they came out with the killer android Brainiac who tools around the universe in a giant skull spaceship.
3. At the beginning of the iron age/ dark age, Brainiac was reimagined as a carnival psychic? Or something? I don't remember, I haven't read those issues in ages.
4. It turned out the psychic was being controlled by an alien from another world. Psychicly.
5. They bring back the killer android Brainiac, probably because of how Brainiac was treated on Superman TAS.
6. Because of Geoff Johns' hard on for the silver age, they reveal that the android Brainiacs are all just drones controlled by the real brainiac who looks like the classic green skinned Brainiac again.
7. The new 52 happens. Brainiac is the badguy at the end of the first arc of Action Comics. He looks like a cyborg centipede alien...thing? It is still green though.
Needless to say, when it comes to Brainiac being kind of like Ultron, it really depends on the year. Even then, they only kind of look alike. Their character motivations are wildly, wildly different.