From Nookipedia, the Animal Crossing wiki
Buck (ヴァヤシコフ, Vayashikov) is a jock horse villager in the Animal Crossing series. As a jock villager, he will appear friendly and competitive when around the player. His name may refer to a vaulting horse used in gymnastics - which also gets the name from a type of horse sport where a rider tries to stay on top of a horse while it is "bucking." His initial phrase is a play on the word "partner", which is pronounced "pardner" by cowboys.
Buck is an olive green horse with a light brown mane. He has grumpy-looking eyes which would suggest he is a cranky, but as a jock villager he would be friendly. He wears an Eight-Ball Tee, which reflects on his jock personality. His muzzle and hooves are white.
Below is a brief description of the jock personality. For more information, click here.
Buck is a jock villager, which means he will often conflict with lazy villagers, because of their lack of exercise. He will also question snooty villagers on their weight, angering them. He will love to exercise and stay fit.
In New Leaf
In Animal Crossing, his house has both exotic and ranch themes, with an Old Brick Wall as his wall and the Opulent Rug as his floor. He has a phonograph in the top-left corner that plays K.K. Casbah. In Doubutsu no Mori+, it instead plays My Place.
In Animal Crossing: Wild World and Animal Crossing: City Folk, he has the Old Brick Wall and the Opulent Rug. His Turntable plays My Place. Buck's furniture include the Exotic Chest and Exotic Screen from the Exotic Series, Ranch Couch and Ranch Chair from the Ranch Series, Classic Table, Fireplace and the Leather Jerkin.
In Animal Crossing: New Leaf, Buck changes his wallpaper to the Pastel-Dot Wall and floor to the Diner Tile. Buck's furniture changes as well to the Sloppy Sofa and Sloppy Stereo in the Sloppy series. His house also contains a Retro Fridge, Mountain Bike, Fan, Cardboard Box (with a Goldfish), Large Magazine Rack, Mini Circuit, and a plant.
Names in other languages