Eduardo is a muscular seven-foot tall (to his horns), 542-pound monster-like "guardian friend" and is one of the gentlest friends in the entire house, despite his menacing appearance. He speaks in third person much of the time. He commonly calls Bloo "Azul," or sometimes speaks Spanish phrases or words. Essentially, it can be considered that he speaks "Spanglish." Despite being a protector friend, he's a total coward, as noted in "House Of Bloo's" by Wilt that he wouldn't hurt a fly, because, as Eduardo pointed out, he's too scared of them.
Eduardo once help the Ultima along with his foster friends for finding the Chaos Emerald and also a cadet Sentinel.