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El Matadora is one of the holders of the "Bestfriend Telecard" and member of The Doraemons. He didn't possess cat ears. Instead; he grow ox horns on his head, which usually poses unintentional threat to people around him.
He lives in 17th-century Spain; where he disguises himself by working as a dishwasher at a Gyuudon restaurant. Under the name of love, peace and justice, he transforms himself into his heroic alter-ego: Keikai-Dora.
(Source: Doraemon Wikia)