

Eduardo is a seven-foot tall (to his horns), 542-pound monster-like "protector friend" and is one of the gentlest friends in the entire house, despite his menacing appearance. He resembles a mixture of a minotaur and beasts from Maurice Sendak's Where The Wild Things Are, with his purple fur, horns, fangs and skull-shaped belt buckle and commonly speaks Spanish, which means he often calls Bloo "Azul", or sometimes speaks Spanish phrases or words. Despite being a protector friend, he's something of a 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. During "Cuckoo for Coco Cards," on Coco's imaginary friend trading cards, Eduardo is classified first as "a big fat baby" (offending Big Baby) then a "chicken" (offending a chicken), then a "scaredy cat" (of which the Big Baby got the last laugh) before being finally upgraded to "crazy idiot" after much trying. He has shown great strength when he is frightened too much, often involuntarily but effectively injuring whoever or whatever is scaring him. This caused him to be a favorite contender in an imaginary friend fighting contest (he would get scared and then end up inadvertently defeating his opponents). It has also been implied that he can be quite intimidating when he is angered (usually when his friends are under what he perceives to be a threat). He also looks a little like and seems to be a parody of James P. Sullivan from Disney and Pixar's Monsters, Inc. He also nurtured a pink elephant squeak toy like a baby in "Squeakerboxxx," even going as far to name it Paco. He also has many Beanie Baggies (a Beanie Baby parody).

If there was any food he was to eat, it would be potatoes. During "Who Let The Dogs In?", he is shown to be fond of dogs (particularly puppies) and he also owns a dog, Chewy (or "Chuy", a Hispanic nickname usually given to children named Jesus). He allegedly has the brain of a three-year old, best demonstrated in "Bye-Bye Nerdy" when Bloo asked him which way is up, to which he responds "I don't know." In "One False Movie", we learn that one of his favorite TV shows is "Lauren is Explorin'", an obvious spoof of "Dora The Explorer". He also loves Christmas, as seen in "A Lost Claus", where he puts a Christmas wreath on his skull belt buckle, sleigh bells on his tail, paints his horns to resemble candy canes, and even places mistletoe on one of his horns and kisses everyone in sight.
In the movie "Good Wilt Hunting", it was discovered that he was created by a young girl named Nina Valeroso, who grew up to be a police officer. She created Eduardo to scare off all the bullies in her dangerous neighborhood. She also needed someone to care for her little brother. Eduardo also taught Nina how to be brave. She calls him her "adorable chicken" (in Spanish). Eduardo still cares for Nina and is fiercely protective of her, when she was questioning a trio of crooks about Wilt's location and they refused to talk, all she had to do was pretend she was in danger and Eduardo almost tore the Foster's bus apart to help her.
Voice actor Thomas James Kenny provides the voice for Eduardo.
--This information on Eduardo is found on Wikipedia.org

My info: Not only can he speak Spanglish, but in my fanfiction series The Torentuff Animals, he can speak three other languages, too: French, Japanese, and Italian. Also, he has an older brother, a Werewolf named Leonardo, and a younger brother, a Dragon named Alphonzo. That bit of info is a pun on Alphonse Elric, Edward's younger brother on Full Metal Alchemist, thanks to a request by Agu Fungus. One more thing, he's the bearer of "Koori" the power of Ice. He was also given an Ice belt buckle, preventing him from fear and giving him a new voice. According to his friends, it is revealed that he has gained the family name "Valerosa" due to being an imaginary friend that Nina Valerosa had created. His middle name is Jose, a Spanish name for Joseph.
Information from Wikipedia's Spanish website, translated by Babelfish: He is a protective imaginary friend who characterizes himself to speak Spanglish. He physically has great horns, dwelled hair, a gray belt with skull and trousers. In spite of being sometimes cowardly an imaginary friend, he is strong and is to trust when his friends are in danger.

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