Tobias Wilson/Relationships

Rachel
Rachel is Tobias' older sister. They are very hostile to each other - Rachel screams at him and his friends that they aren't invited to her party, so Tobias has to blackmail her into inviting them.

Gumball
In "The Third", he becomes Darwin's and Gumball's friend for twenty dollars, but ignored Gumball and hung out with Darwin instead. When Gumball and Darwin reunite at Tobias' house. Tobias asks if he can play with them, which both of them deny. In "The Quest", he ignores Gumball's threat and tossed Anais' stuffed Daisy the Donkey out of the School Bus' window.

Darwin
Tobias was a good friend to Darwin in "The Third", but this may have been because he was paid twenty dollars to do so. He also went out of his way to save Darwin from kissing Masami by helping Banana Joe chop down the treehouse.

Banana Joe
Tobias seems to be pretty good friends with Banana Joe. In "The Pressure", he spends a lot of time with him, and together they formed a pact along with Gumball and Darwin, promising to put their "pals before gals". When Darwin breaks this pact, he accompanies Banana Joe in chopping down the girls' treehouse to save Darwin from kissing Masami.

Rob
Rob hung out with Tobias throughout "The Party". Rob might be Tobias' good friend.

Penny
Like Gumball, Tobias has a crush on Penny. This occasionally causes tension between the two, but unlike Gumball, who is shy around Penny, Tobias is more confident in his abilities to woo her, though Penny does not return her feelings to him like she does to Gumball.