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Lagoona is as laid-back as she is friendly, and is friends with almost everyone at Monster High. She has a relationship with Gillington Webber.
She is voiced in English by Laura Bailey.
Lagoona has a very friendly and laid-back personality, even her clothes reflect her easygoing nature. Most of the time, Lagoona is very calm and level-headed, but she is prone to strong emotions, especially when it comes to romance and friendship. She is almost never outright mean, but she is passionate about friendship, and will defend her friends fiercely. However, she is forgiving and won't stay mad for long, as it's just not her nature.
Lagoona is also an environmentalist; trash and pollution in the ocean anger her, and she shows sympathy to many aquatic elements, including fish, frogs and all water creatures.
Lagoona has pale blue scales that cover her entire body, as well as webbed hands and fins potruding from her lower arms and legs. She has curly blonde hair that's streaked blue due to the chlorine in the school's pool, as well as freckles that dot her face.
In the film, a scientific expedition takes a steamship journey up the Amazon River, in search of fossilized remains that they believe provide the link between man and fish. Meanwhile, members of the research team are systematically killed by a mysterious being, eventually revealed to be the prehistoric fish creature whose skeleton they were searching for. The Gill-man was played by Ben Chapman (on land) and Ricou Browning (in the water); Dr. David Reed was played by Richard Carlson, and Kay, the lead scientist's girlfriend, was played by Julie Adams.
Lagoona's father "doesn't really live on land. For sure, he's got a little beach house where Lagoona Blue lives. It's got a killer dock that goes out over the water." According to her School's Out diary, her mother is an ocean nymph who "still lives in the same scary sweet little grotto as she did when dad met and married her. Being a nymph means that mom can leave the water and hang out on land as long as she doesn’t travel too far from her grotto otherwise she gets really weak".
In the Monster High book series, Lagoona's parents live in Australia, but she lives with her uncle (who is currently unnamed) and her aunt Coral (Carol) in Salem. Lagoona moved in Salem as a foreign exchange student from "down under" as she says in "New Ghoul @ School".
In "Parent-Creature Conference" the ghouls tell Slo Mo that he is supposed to be posing as Lagoona's Great-Aunt Lantic; this relative may or may not really exist. In her 'Basic' diary, Lagoona mentions having a few cousins 'living up north'.
Lagoona is very easygoing, and wants everyone to be friends; as such, she is friends with everyone, even the hard-to-get-along-with Cleo (but she hangs out with Cleo, Ghoulia, Frankie, Clawdeen, Abbey and Draculaura the most, so they're probably her closest friends). She is rarely seen disagreeing with anyone, except Toralei when she openly mocked the fearleading team and her. In "Bean Scare, Done That" she stated that she, Frankie, Cleo, Draculaura, Gil and Clawdeen have 500+ friends all together.
Lagoona's pet is a piranha named Neptuna who is carried around in a fishbowl purse. She is shown to be very feisty, and enjoys nipping other monsters when they least expect it. She has not appeared in the cartoon although other piranhas are seen in "Fright On!" and presumably owned by Lagoona and/or other swim team students.
Gil's family holds a negative view on salt water monsters, which Gil kept a secret from Lagoona until "Road to Monster Mashionals". Lagoona encouraged him to take a stand against his parents; he tells her he informed his parents, but in "HooDoo You Like?", Toralei Stripe arranges for an entire page in the Fearbook to be dedicated to Gil's and Lagoona's relationship, forcing Gil to reveal that he lied, and his parents didn't know they were dating.
Lagoona gave him an ultimatum: either he'd stand up for them, or he should forget about her. After a lot of doubt and self-reflection, Gil chose the honorable path in "Desperate Hours" and told his parents he was dating a creature from the sea that was nothing like the horrible creatures they always talked about. His parents didn't take kindly to it, but the strain went off his and Lagoona's relationship.
After the summer vacation, Gil didn't return to Monster High because his parents enrolled him in a different school to keep him away from Lagoona. He returned in "Here Comes Treble", and he explained in "Fright On!" that his parents gave up and allowed him to go back to Monster High and his salt water love.
In Monster High, Lagoona is known as "Blue" around Normies. She is constantly worried about her skin drying around and wears gloves to hide her webbed hands, and baggie pants or rainboots for her legfins. She is seen often with Lala (Draculaura).
In The Ghoul Next Door, Lagoona was one of the biggest supporters of human-monster equality. She was the first to stand up to Cleo, saying that she's been lying to her parents back home, saying that Salem was paradise, and that she wishes that it was the truth, implying that RAD's are discriminated overseas as well as in the USA.
In Where There a Wolf, There a Way, she appears at the RAD meeting, where she demands to know Cleo's part in the revealing of the video. She is very tense and grumpy through the whole meeting, especially when her Aunt Coral starts to criticize Frankie and tells Lagoona they have to leave. She was the only one of the ghoulfriends that didn't appear at Clawdeen's party.
She does reappear sometime between the third and fourth Monster High book, as said in the first chapters of Back and Deader Than Ever, where she assists Lala and Claudine (Clawdeen) with the T'eau Dally submission letter.
- October 8, 2008: Mattel requests the trademark for Lagoona Blue.
- May 5, 2010: The Monster High website goes live, featuring Lagoona Blue's profile.
- May 5, 2010: Lagoona Blue's profile art is revealed.
- May 5, 2010: Lagoona Blue makes her animated debut in the Higher Deaducation commercial.
- May 5, 2010: Lagoona Blue makes her 2D cartoon debut in "Jaundice Brothers".
- Early July, 2010: Lagoona Blue's first doll is released as part of the 'Basic' series.
- Early July, 2010: Lagoona Blue makes her diary debut in her 'Basic' diary.
- September 1, 2010: Lagoona Blue makes her Monster High book debut in Monster High.
- Early December, 2010: Lagoona Blue's Friends plushie is released.
- February 12, 2012: Lagoona Blue makes her 3D cartoon debut in "Why Do Ghouls Fall in Love?".
- Lagoona seems to be able to talk to frogs and other amphibians, like Cleo can talk to snakes, and Draculaura with bats.
- Although Lagoona says that she is from Down Under (the sea), the post cards addressed to her from Gloom Beach list her address as Down Under (the ocean).
- In the School's Out Line, Lagoona was mentioned as voted "Most Likely To Save You From Yourself", and on an official Facebook photo, she was voted "Most Likely To Save the Planet".