Anais

Anais is by far the most intelligent member of her family, although her young age prevents her from really being noticed and taken seriously by adults. She has been shown on numerous occasions to have a knack for solving problems, such as the time she figured a way out of the house when it flooded in "The Responsible," and the time she developed a complex solution to solve the problem of getting her grandmother's luggage up a flight of stairs in "The Kiss." Even though Anais is four years old, she attends Elmore Junior High because of her extremely high IQ; however, she is not in the same class as her brothers, and instead goes to an eighth-grade class located elsewhere in the school. Anais is also a valued member of the school's Physics Club, and her vast knowledge of the subject has actually saved her from being vaporized by Bobert in his combat form in "The Club."

Anais is a remarkably cunning strategist as well, revealed in the episode "The Remote," and "The Password," plotting elaborate schemes, and decoying everybody's perceptions to achieve her goal, though she is often underestimated due to her significantly young age, which she tends to use to her advantage.

Sometimes she is respected for her intelligence like in the episode "The Password," when Gumball says "Clever girl" after finding out about Anais' plan to hog the computer all to herself by once again by driving the Watterson family out of the house, similar to the episode "The Remote."

Anais can also be considered the most mature member of her family, aside from her mother. She often takes care of her brothers in many ways, like helping them with their homework, and making their breakfast, as said in "The Responsible." Due to her young age, however, she is prone to occasionally acting childish, and still has stuffed animals.

Anais has shown some signs of having her mother's fiery temper. When her brother accidentally lost her doll, she was extremely upset and demanding, threatening to tell their mother what had happened. On another occasion, after finally taking Granny Jojo's bags upstairs, when asked to bring them down, she instead grew furious, and kicked her suitcase out the window. Also, in "The Vacation," Richard hugged her to protect her, and she violently attacked him, thinking he was a monster. In "The Pest," Gumball and Darwin awoke from their sleep and found Anais violently and mercilessly attacking her stuffed animals because she was angry at Billy Parham for bullying her at school, and even wanted to beat him up, showing that she can be just as angry and violent as her mother.

Even though Anais is very mature for her age, there are still some occasions where she reverts to childish behavior. She is a huge fan of Daisy the Donkey, as evidenced by her Daisy plush toy, and her extreme enthusiasm for the "Daisy on Ice" show. She also knows how to manipulate others by looking cute, as proven in "The Quest."

In "The Friend," it is shown that Anais is very socially awkward. She states that she does not have any friends, which is why no one shows up at her party.