Nemo

Nemo is the tritagonist of Finding Nemo and a major character in Finding Dory. He was the only child of Marlin before the rest of Nemo's siblings were killed as eggs. As a result of the egg damage, Nemo's right fin is smaller than the left, thus Marlin worries about him and becomes overprotective of his only son. He was given his name because Coral mentioned she liked "Nemo" as a name while they were looking at their eggs.

Why He Keeps Swimming

 * 1) He is a character kids can relate to in the movie.
 * 2) Since he's a child, he's a very energetic clownfish who is quite eager to explore the world around him like when he was ready to go to school on the first time he went there.
 * 3) He looks cute.
 * 4) Nemo has some bravery in him. He attempted to risk his life to jam the filter of a fish tank, although he fails on first, he succeeds in his second try. Nemo and Marlin also attempted to save Dory who was at an aquarium. Nemo got even more courageous when he found out about Marlin going on a whale of an odyssey to find Nemo.
 * 5) Nemo's relationship with his father is what defines Nemo. He loves his father but he went into some character development after having serious conflict. He felt guilty after getting caught by some scuba divers and being placed in a fish tank with other fish.
 * 6) He's quite a leader. He led a school of fish to swim downward to break a net that was capturing them this causing the boat to tip over. That saved Dory from being captured.
 * 7) Nemo is a lot more mature compared to the first film when he was reintroduced in Finding Dory. He took the mission to find Dory's parents better than his father and attempted to help Dory. You can thank the events from the first film for making him much wiser.
 * 8) He's very forgiving. He forgave Dory for her short-term memory loss.
 * 9) He attempted to troll Darla by playing dead just so he can get to the toilet pipe that leads to the ocean. Though in real life, fish would die if they were to go on the pipe due to what's inside the pipe.
 * 10) He's by far the only sole survivor of a barracuda attack when he was an egg.

The Only Bad Quality

 * 1) Nemo is often annoyed by Marlin's overprotective behavior. It has gone to the point where Nemo clearly said that he hates Marlin in the first movie.

Trivia

 * He is Pixar's first-ever titular character
 * He makes a cameo in Monsters, Inc. as one of Boo's toys. He also appears on the wall of the Trailer Son and Mom's trailer when Sulley and Mike throw Randall through the door. This is a part of Pixar’s tradition of always including an Easter egg to reference their next film.
 * He appears as a sticker in Andy's toy chest from Toy Story 3
 * Nemo appeared on a board game in Mason's room in Toy Story That Time Forgot when Bonnie's toys followed a Dimetrodon Battlesaur.
 * Nemo can be seen on a different board game in Inside Out, next to the card castle that Bing Bong, Joy, and Sadness are going to.
 * His name could be a reference to Captain Nemo from 20,000 Leagues Under the Sea with the 1954 film's theme song "A Whale of a Tale" being briefly sung by the Moonfish school serving as another reference.
 * Interestingly, Nemo is the only named clownfish in the Finding Nemo franchise to not be named after a real-life animal. Marlin and Coral, however, are named after real-life animals.
 * Nemo, in turn, is actually Latin for "no one." In the aforementioned novel, Captain Nemo was so-called since nobody ever knows what his real name is if he ever had one. For the record, he was an Indian prince named Dakkar.
 * This could also be why Nemo is not included on posters for the first movie
 * Nemo's friend Sandy Plankton could be a reference to Nickelodeon's SpongeBob SquarePants franchise characters, as "Sandy" and "Plankton" are names of characters from that show.