Darwin Raglan Caspian Ahab Poseidon Nicodemius Watterson lll is one of the main characters in The Amazing World of Gumball and the main protagonist in The Amazing World of Gumball: The Movie and The Powerpuff Girls Crossover. He used to be Gumball's pet goldfish, until one day he started to grow legs, speak, and eat other foods that are not fish flakes, and became Gumball's loyal friend.
Darwin is a goldfish with legs. His goldfish-shaped head takes up his entire body, with his fins and legs hanging down from it. He has retained his goldfish tail and fins, the latter of which he now uses as arms and hands. His legs are much longer than his body, ending with plain feet matching the color and texture of the rest of his body. Usually, though, he covers them with green and white sneakers. A common misconception is that he also wears a black shirt, but that is actually just a shadow casted by his big head.
Darwin apparently has thick coatings of blubber, making him resistant to pain. The blubber's radius is about the length of Gumball's arm, as shown in The DVD, where Gumball had to sink his whole arm into Darwin's head just to reach his cheekbone. Darwin is shown naked in The Meddler without his shoes, but his feet are censored for some strange reason. Though his feet are shown in The Goons, they were shown uncensored.
Due to his sudden entrance into the world, his perspective of it is somewhat skewed and naive. He has trouble understanding many situations. Often people have to point out his misconceptions and faults, such as the time he didn't know the definition of dates and when he used a DVD as a pizza cutter.
He also has poor memory, likely based on the misconception that fish have a memory of only three seconds. To him, basic spelling is complex, and the only numbers he knows are 7, 2, and 9. Also, in "The Mystery" he fails to remember anything he did the day before, while all of his other classmates remembered clearly.
Despite being humanlike, Darwin still sleeps in his fishbowl; however, because he has grown in size, he gets rather squished in there. He also still seems fond of fish flakes, as shown in "The Responsible" and "The Picnic." Other foods he enjoys are cookies, chips, and ice cream.
Throughout the series, Darwin has referred to Richard and Nicole as "Mr. Dad" and "Mrs. Mom". Whether this is because he shows more respect for them than a child would, or just the fact that he has some doubts of them being his "parents" is anyone's guess.
Darwin falls in love at first sight with anything that wears a pretty dress. An example of that would be in "The Dress," where he saw Gumball in a dress and completely fell in love, thinking he was a girl. At that time, he was so in love that he said to the "girl": "I love you", and a photo of him trying to kiss "her" was shown. When the dress later fell onto a fire hydrant, Darwin then fell in love with it.
Humorously, Darwin appears to be somewhat of a ladies' man. He has already had three romantic encounters: one with Masami, another with Rachel, and a third with Carrie. Masami chose him as her fake boyfriend, and even went so far as to kiss him. Rachel gave him a kiss on the cheek after he cheered her up at her party. Carrie received a spontaneous kiss from him, with him saying that he has wanted to do that for a long time.
Despite his kind and cheery nature, Darwin is shown to have a more serious side to his personality that becomes more prominent in the second season. He is sometimes a jerk on accident because in "The Phone", he killed Gumball being left with 2 lives. He is capable of having angry and violent outbursts as seen in "The Banana" when he believed Joe had intentionally destroyed his desk and school supplies. He proceeded to break into Joe's locker and vandalize his belongings, and then later tried to fight him in Mr. Small's office. This happens again in "The Treasure" when he tries to destroy a mailbox with a shovel after being kept awake all night by Anais. But the most notable event was in "The Words" when he starts to be rude to everyone, and later even becomes a villain. He is also shown to be sarcastic at times, shown in "The Phone" and "The Flower".
It is revealed when Jealousy possessed him that Darwin is rather happy with his life, unlike the others in the room.
It is shown in "The Words", that Darwin is unable to speak his mind.
Despite having legs and human-like abilities such as breathing air and eating normal food, Darwin still sleeps in his fishbowl; however, because he has grown in size, he is rather squished in the fish bowl and takes the shape of it. He also still seems to like fish flakes, as he took a snack break with some fish flakes when the house was flooded in The Responsible. He has been shown that he likes to eat a lot. He particularly likes fish flakes, but he is also fond of cookies, chips, and ice cream.
Throughout the series, Darwin has referred to Mr. and Mrs. Watterson as "Mrs. Mom" and "Mr. Dad". Whether this is because he shows more respect for them than a child would, or just the fact that he has a slight questionality of them as his "parents" is anyone's guess.
Darwin falls in love at first sight with anything that wears a pretty dress. An example of that would be in The Dress, where he saw Gumball in a dress and completely fell in love, thinking he was a girl. At that time, he was so in love that he said to the "girl": "I love you", and a photo of him trying to kiss "her" was shown. When the dress later fell onto a fire hydrant, Darwin then fell in love with it.
Darwin tends to follow Gumball's advice and suggestions, despite them being stupid and childish. More often than not, Gumball is not a very good influence on Darwin.