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Mollyis a musical female guppy and a natural born leader. She is kind, friendly, helpful, and a really good friend, like Oona. Molly is co-host of the show along with Gil, and the main protagonist along with him. Due to her bubbly personality, every guppy (mostly Gil) wants to swim with her. She always makes it a point to turn to the camera, and talk to the audience directly, ensuring that they stay at the center of all the action. Molly sings nearly all the pop songs with her blue fish microphone (changed to yellow), while the other guppies sing backup. She's good friends with all the guppies, Bubble Puppy, Gil, Goby, Deema, Oona, Nonny, Zooli, and Mr. Grouper. In Bubble Baby!, Molly welcomes her new baby sister, Mia.
In A Dolphin is a Guppy's Best Friend!, She's give a hug with Buddy. In Guppy Style! (Part 2), She's with the world famous pop star, Stylee.
Molly is the bubbly leader of the Bubble Guppies along with Gil. From the second season on, she's first at lining up to go outside, Goby being the first in line in season 1. She's lead singer in almost all the songs. Despite receiving more attention than anyone else (excluding Gil who gets as much attention as she does), Molly is not a selfish guppy, and she normally thinks about others before herself.
Molly can get annoyed with Gil sometimes, but never seems to get upset with him. She usually smiles, and helps him out of the trouble he put himself in, yet she doesn't shout at him. Sometimes Molly will get an object to prevent Gil from making anymore noise. Such as in We Totally Rock!, Gil kept playing his guitar out loud and prevented Molly from saying "It's time for Bubble Guppies!", so she got some amplifiers and played a loud guitar chord through them. It blew Gil away, causing him to listen to her.
Molly has many skills. She has an interest in reading as seen in the pop song: We're Gonna Fly when she was reading the book Mother Goose, referred to in the song as her favorite book.
Molly has a strong singing voice. It can be heard throughout the ocean. She sings almost every pop song in the show. Sometimes Gil sings a pop song while she sings backup and/or in a Dance song. This happened in pop songs such as Our Great Play, I Need to Rock!, and X Marks the Spot!.
Molly always has a blue fish tail-shaped microphone whenever she's singing. It has been seen in almost all of the pop songs, but in The Restaurant, her microphone was seen in the first verse, and disappeared throughout the chorus, and then came back in the last verse.
Molly dances in nearly every pop song, and has danced in a few dance songs.
Molly is the type of guppy who reacts really quickly. She can dodge fast objects that are coming at her. She can pull people out of the way. In other episodes like Fishketball! She quickly ducked out of the way when she almost got hit with a meatball, and in Come to Your Senses!, she quickly caught the ball when it bounced too high. Molly is very agile.
Molly is really sporty as seen in the episode Fishketball! She is good at shooting hoops and throwing the ball. She is also able to catch balls with her left hand very well. Sometimes Molly is right handed at throwing. Another example of Molly's athletic ability is shown in The Glitter Games!, in which she kept up with Demanda throughout all of the physical challenges, despite not being as prepared.
Molly has light brown skin, long bright pink hair which was brown during a song in Good Hair Day!, and braided and brown eyes. She has a blue tail with swirling light blue and dark blue patterns on it, and her bikini top matches her tail.
Gil is Molly's best friend as well as her co-host. The two are closer than any of the other guppies and they both sing the most pop songs. Molly cares about Gil and is the only bubble guppy to call him "Gilly". Throughout the show, there have been hints that Molly has a crush on Gil. She has hugged him lots of times and she often gives him compliments. In the Super Ballet Bowl, she played the princess and Gil played the Prince, and he caught her when she jumped. Molly and Gil are the main characters and protagonists, and they are shown throughout every episode.
Molly and Goby treat each other as brother and sister. They enjoy playing together, sharing intelligence and they both love playing music. These two friends have also had a few story segments together.
Deema and Molly are best friends. They enjoy playing together, and they love to play with their toys. They also like to play sports together. They would often sing together in some songs, and do duets in dance numbers. Plus they do some story segments such as the one in The Oyster Bunny!.
Molly and Oona are also best friends; they love to play games and they love to care for each other's possessions. Molly and Oona don't talk that often but they always think about others. After Molly rescued Dusty's horse in The Cowgirl Parade! Oona gave her a hug. It isn't very noticeable though.
Molly's relationship with Nonny isn't well known. She hardly ever pays attention to him. But Molly and Nonny do get along. These two held hands once in the song Spooky!, and they did a dancing duet.
Molly has been a main character in fourteen episodes, which makes her the second guppy to have the most appearances as a main character. In Bubble Puppy's Fin-tastic Fairy Tale!, when Gil turned Bubble Puppy back, Molly and Gil were shaking hands.