El Matadora, alias Keikai-Dora, belongs to the Doraemons, robotic cats from Doraemon’s Robot School. He sports ox horns in place of cat ears, which inadvertently intimidate others. His attire features a Magic Cloak capable of deflecting projectiles or repelling foes, and he shares the rare four-dimensional pocket—exclusive to him and Doraemon within their group.

Disguised as a Gyūdon restaurant dishwasher in 17th-century Spain, he covertly operates as the gallant Keikai-Dora, championing love, peace, and justice. His Zorro-inspired alter-ego dons the cloak as his sole visible change. Later, he relocates to Barcelona’s "Carmen" roast meat restaurant, named for Carmen, his beloved and the chef’s daughter.

Brash, flirtatious, and macho, he shifts to courteous charm around women, greeting them as "señorita" and presenting roses. Beneath his rough demeanor lies a romantic streak, evident in his respectful rapport with Dorami, Doraemon’s sister. His immense strength allows feats like hurling bulls or hoisting elephants, yet often causes accidental havoc—shattering dishes during shifts.

Aspiring to matador fame, he hones bullfighting and fencing prowess. He competes in the Robolympics but faces weightlifting disqualification for unorthodox techniques. His unpredictable napping habit surfaces even mid-crisis.

A rivalry simmers with Wang Dora, marked by fiery clashes despite mutual camaraderie. He flavors dorayaki with spaghetti sauce, deviating from group norms. His timeline-hopping escapades intersect with Spanish history, weaving tales of heroism and humor fueled by his brawn and untimely naps.