This show never ceases to amaze me as it just keeps on building itself over and over with its jokes. Anais is such a fun character who doesn't get that many episodes focused on her. At first, this plot seemed kind of out of character for here, but you really have to watch it all the whole way through. Gumball and Darwin read Anais' diary and find out she's made a new friend they suspect is a social parasite. Gumball reads it in her voice and it's hilarious when he turns into his mom for a brief moment.
The jokes and story are so unpredictable and so creative. It seemed like this would be kind of lame because there was already an episode where Anais tried to make a friend. They end up doing a really cool variant with it this time. 10/10.