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Koko is a small monkey-like creature, and Brainiac's pet and companion. It is called a "space monkey".
Pre-Crisis
He accompanied Brainiac aboard his spaceship as they captured alien cities. ("The Super-Duel in Space")
Post-Crisis
A larger, more ferocious version of Koko lived aboard Brainiac's ship, and fought Superman. Superman commented that Koko was likely one of Brainiac's genetic experiments. ("Superman: Brainiac")
In the 31st Century, Brainiac 5 still kept Koko as a pet.