Lopunny is a bipedal, rabbit-like Pokémon with a dark brown fur and a short, round tail. It has pink eyes with black markings on the inner edge, long tufts of cream-colored fur above its eyes, and a small, pink nose. Similar tufts of fluffy cream-colored fur cover its wrists, lower legs, and the ends of its long ears, which bend shortly above its head. Lopunny is very proud of these ears and never fails to groom them. If the ears are roughly handled, Lopunny will kick in retaliation.
Lopunny's fur is warm and light, and Lopunny sheds it twice a year. Its winter coat is soft and fluffy, and filled with plenty of insulating air. This fur can be used to make warm mufflers and hats. Lopunny is a timid Pokémon that constantly monitors its surroundings, and will cloak its body with its ears or spring away when it senses danger. Despite this, it is capable of unleashing superdestructive kicks with its lithe legs. Lopunny's kicks are said to be similar to those of karate masters, which allows it to drive back foes with no issues.
As Mega Lopunny, its personality drastically changes, becoming extremely aggressive with wild fighting instincts. In order to become more capable of fighting, it sheds the fur on its neck, upper torso, fingers, and legs, forming black patterns on the legs that resemble ripped pantyhose. The tufts of fur above its eyes combine to form a single butterfly-shaped crest. The cream fur on its wrists and ankles becomes more round instead of fluffy. Its ear fur now only covers two segments of each ear in fluffy bands. When Mega Evolved, a full-power whip swing from its ears can crumple steel plates.
Pokémon Mystery Dungeon: Explorers of Sky: Team Charm debut in their own Special Episode, Lopunny being the playable character. She is shown to be the fun-loving member of the group, even ending almost all of her sentences with hearts. The team hears about the treasure-filled Southern Jungle. They are advised to stay away by a Bellossom but the team continued on. They find a passed out Wigglytuff, who fainted due to hunger and give him a Perfect Apple, revitalizing him. They encounter Team AWD, who believes the team is pathetic. Before they enter, a Sentret pleads Charm to stop AWD, saying they were cruel to it. The team arrives at the dungeon's end, which holds an empty chest. AWD accuses Charm of taking the treasure and they fight. Wigglytuff appears to stop the brawl and reveals that the chest is a Ditto. The Bellossom and Sentret earlier were also him. He reveals he is there to guard a Time Gear and the teams leave. They later bribe Wigglytuff with a Perfect Apple to join their team.
Lopunny and its pre-evolved form share their category with Scorbunny and Raboot. They are all known as the Rabbit Pokémon.
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Lopunny appears to be based on a lop rabbit. It resembles a fashion model wearing women's fur or faux fur-cuffed gloves and boots, while Mega Lopunny may be inspired by 1980's styled aerobics outfits. Due to the size and placing of its eyebrows, which resemble antlers, it is possible it is based on a jackalope. It may also be an inspired caricature of a Playboy Bunny or other bunny girls as seen in popular culture. The bunny girl costumes of Playboy fame are still quite popular in Japanese adult media, which might explain Lopunny's coquettish cry and feminine figure.
Lopunny may be a combination of lop (a breed of rabbit with ears that flop over rather than stand erect) and bunny.
Mimilop may be a combination of 耳 mimi (ear) and lop.