Buena Girl (known as Super Niña in the pilot) is a 10-year-old and the most knowledgeable among the Three Mascaritas, and she is usually the one who helps Rikochet and the Flea out of their situations. In Lucha School, she was 9 years old. In season 2, she was 11 years old. And in season 3, she was 12 years old. She is somewhat strict on rules, which causes friction between her and her friends. She brushes her teeth eight times a day. Her signature move is the "Buena Bulldozer Of Truth", where she transforms into a bulldozer and bulldozes her opponent. She claims to be a descendant of the Slamazons, an ancient tribe of female masked wrestlers (play on the Amazons). Normally, Buena Girl remarks "It's not right!", when something goes against the Code of Masked Wrestling or anything outside the rules. She also alternates the Spanish word buena in place of its English counterpart word good in some sentences. Her parents are "Buena Mom" and "Buena Dad". It is also hinted that she may have a secret crush on Rikochet and secret creepy obsession with the Flea. She was voiced by Kimberly Brooks.
She has a dark pink pony tail, and dark tan skin. She also wears a white mask with two purple stripes on the top, and she wears a white shirt with light green underwear tights, and she wears purple boots.
- She is only seen barefoot in one episode: Chinche.
- Her appearances in the Stephen Squirrelsky and Friends' Movie Spoof Travels are Kermiladdin 2: The Return of McLeach, AiAi The Monkey and A Day for George, The Reindeer and the Deer, Animal Story 2, AiAi the Monkey's Grand Adventure: The Search for Tails, A Cartoon Character's Life, and Nikki's Adventures of Sing Along Songs Episode 7, Here Comes Winnie the Pooh, Animals, Inc, Simba 2, Miss Bianca and the Bernard 2: Fievel's Adventure, FernGully: The Last Rainforest, A Pooh in Central Park, Bubblesrella 2: Dreams Come True, The Brave Little Piglet, Kung Fu Owen, Nikki's Adventures of Sing Along Songs Episode 8, The Thomas O'Malley Movie, Kermit Returns, Fievel the Red Nosed Mouse and The Island of Misfits, Nikki's Adventures of Sing Along Songs Episode 9, Cloudy with a Chance of Meatballs, Finding Alvin, Animated Tale, The Forest Book 2, Nikki's Adventures of Sing Along Songs Episode 10, Madagascar, and Sleeping Beauty and will even be in more movie spoof travels.