Darwin Watterson/Relationships

Gumball
Darwin is Gumball's best friend/brother/pet. They're almost always seen together, whether it's at school or home or off on some crazy misadventure constructed by Gumball. Throughout the show, they have worked together to overcome many a sticky situation even though Gumball was the one that usually pulled them into said situation, and showcasing their strong bond and friendship. Whether it's fighting a T-Rex, babysitting their precious sister, or even shaving their dad's horrifyingly hairy back, these two have definitely got each other's backs.

Anais
Darwin may not like Anais as much as he likes Gumball, but he definitely understands her. When Gumball's in trouble, Anais is the first one he runs to. Darwin also convinced Gumball to help Anais when her doll was stolen in "The Quest". Darwin also obviously trusts her, as he could tell her that he put Gumball's embarrassing video online.

Nicole
Though the two don't interact often, they have shown care and affection for each other at certain points. In "The Genius", Nicole was furious, and later on depressed, when the school took Darwin away from them, and in "The DVD", Darwin scolded Gumball for leaving their mother behind to deal with a vicious dog.

Richard
Darwin sees Richard as more of a friend than an actual father figure. Instead of Richard teaching Darwin how to be a man, he goofs around with him. This is strongly evidenced in "The Goons" and in "The Prank", where Richard joins in on Gumball and Darwin's childish antics. Darwin is also Richard's favorite child, as revealed in "The Goons".

Rachel
Rachel is Darwin's possible love interest and they may have a relationship going on, as shown in "The Party" Darwin cleaned her house after it had been ruined. After this, she kisses Darwin, as a thank you. It is unknown if their relationship is still going on as Rachel has yet to appear in season two, while in Halloween it is shown that Darwin also has a crush on Carrie.

Carrie
Carrie is a good friend to Darwin. Carrie is also the love interest of Darwin. In "Halloween", when Darwin becomes a ghost, he kisses Carrie. After he passionately kisses her on the mouth he claims he wanted to kiss her for a long time, making her blush. However in "The Words", he calls Carrie "one more emo freak" which means that his feelings for her are most likely mixed.