*Lagoona Blue is a 2010-introduced and all-around character. She and her younger siblings are an unusual kind of sea monster, as they are the offspring of a sea monster and an ocean nymph. Lagoona is a student at Monster High, having come all the way from the Great Scarrier Reef to expand her horizons. And she's done so admirably. If there is one person in the entire school who could befriend anyone, it's Lagoona. She is patient, kind, and considerate, but does not sugarcoat her message or allow anyone to walk over her. This, along with her considerable skill, is why she's been chosen as the captain of the Swim Team. The one exception to her no-nonsense attitude is her boyfriend, Gillington Webber. She gives him leeway beyond her standards despite the harm it does her because she is aware that his home situation is far from ideal. She is not happy with the situation, but she knows she would also not be happy without him.

If there is one person in the entire school who could befriend anyone, it's good ol' Lagoona. She has a very friendly and laid-back personality; even her clothes reflect her easygoing nature. She is patient and considerate but does not sugarcoat her message or allow anyone to walk over her. She is rarely outright mean, but she is passionate about friendship and will defend her friends fiercely. This, along with her considerable skill, is why she's been chosen as the Swim Team captain.

The one exception to her no-nonsense attitude is her boyfriend, Gillington Webber. She gives him leeway beyond her standards despite the harm it does her because she is aware that his home situation is far from ideal. She is not happy with the situation, but she knows she would also not be happy without him. Even though Gil's parents don't want him around Lagoona, since she's from the seas and he's a freshwater manster.

Lagoona is also an environmentalist; trash and pollution in the ocean anger her, and she shows sympathy for many aquatic elements, including fish, frogs, and all water creatures. She loves helping water creatures and wishes for the ocean to be clean.

Lagoona is a slim, light cyan-skinned sea monster with lime-green eyes, freckles on her face, thick eyelashes, grayish-purple brows and long, curly blonde hair with light azure streaks (due to the chlorine in the school's pool). At times, she styles her hair in a braid, a ponytail or mohawk. As per her type of monster, she has fin-shaped ears, webbed-hands and fins on her arms and lower legs - all of them colored in a shade of cyan. Lagoona also wore makeup consisting of thick mascara, light violet eyeshadow, deep-pink lipstick, and hot-pink nail polish painted on both her finger and toenails.

Lagoona's clothing reflects both her tomboyish-nature and her sea monster heritage; she wears a pink flower on her head and an elbow-length, scale-printed misty-teal hoodie-jacket which includes attached sparkling-cyan fins on top of the hood, black trim on the bottom sides, small pearl decorations on the sides, and cyan trim on the black sleeves. Her jacket is usually worn over her sparkling, black and deep-pink scale-printed swimsuit. On her waist are a set of black sport short-shorts with cyan trim, sparkle-like dots and cyan and deep-pink stitching on the sides, worn over her knee-length pale cyan fishnet shorts. Lagoona also dawned black wedge sandals with black and white stripes on the front, resembling a piano, followed by deep-pink accents. She accessorizes with a golden-beaded necklace with a large seahorse-shaped pendant, followed by a matching bracelet on her left wrist.*