Patrick Star is the best friend of SpongeBob from the show SpongeBob SquarePants.

Patrick's color palette is a lovely combination of pink, purple, and green. Why is he pink? Well, Patrick is a starfish, and many starfish species are brightly colored in various shades of red or orange.

But another reason is that red (which pink is a tint of) together with blue and yellow are tetradic colors. And these are the colors of the 3 sea neighbors: SpongeBob, Squidward, and Patrick.

While Squidward is usually portrayed as grumpy and miserable, Spongebob and Patrick are almost always happy and optimistic. Yellow and pink do make for a joyful match, emphasizing the pair's joyful personalities and putting them in contrast with Squidward's blue or Mr.Crab's red.