Oscar Fishtooth
Species: Catfish/Siamese fighting fish hybrid
Gender: Male
Age: 15
Nationality: American
Hometown: Bud's Pets
Professional Information
  Freshwater High
Friends and Family
Bird Mom (adoptive mother)
Milo (brother)
Albert Glass
Jumbo Shrimp
Love interests:
Bea (soulmate)
Angela (ex-girlfriend)
Behind the Scenes
First Appearance:
  Bea Stays in the Picture (s1)
Voiced by:
Justin Roiland

Oscar Fishtooth is a neurotic fish and is the brother of Milo. He is the main deuteragonist of the series. Oscar is known to have a huge, almost obsessive crush on Bea, his later girlfriend; his locker is decorated with a shrine to her, and he often accidentally mentions his love for Bea.  


Oscar can be seen playing video games often. He seems to be much of a technology nerd. He is a friendly fish that could be friends with anyone. Oscar tends to be the "worry-wart" of the trio, and is usually the ignored voice of reason. When he is alone with Milo he seems to be his calmest, opposed to when he is with Bea or Clamantha and he is the most high-strung. He seems to be into role play and strategy games. His dream is for Bea to like him back.



Oscar is Milo's roommate and brother. Milo sometimes makes Oscar do things he doesn't want to do. Since they are brothers, their relationship is strong, however, they broke up when Milo was impossible to live with, because of his dirtiness. At the end, they became brothers again in ("Dances with Wolf Fish").

In the episode "Brothers' Day" it's seen that Oscar has very strong feelings for Milo. Milo leaves home after hearing Oscar say he needs a "break" from Milo. Oscar attempts to bring him back home, but fails. Even more sorrowful than before, Oscar begins sobbing over Milo's "runaway", but Milo returns to him from a bus and tells him he was selling some old items so he could buy himself a "Video Boy" and not bother Oscar.

Bea Goldfishberg

Main article: Oscar and Bea's relationship
Oscar's drawing

Oscar's drawing of Bea and himself

Oscar is in love with on Bea, although she does not seem to be aware. He once drew a picture of him and Bea surrounded by hearts that said, "Oscar+Bea Forever".

He often tries to comfort Bea when she is upset, and is afraid of losing her ("Fish Sleepover Party").

Once he taped a picture of Bea over a doll and
Oscar and Bea Dancing

Oscar and Bea dancing during the theme song.

called it "the most beautiful fish in the world" comparing her to Helen of Troy ("Fail Fish").

When Bea was trying to become an adult, Oscar kept trying to prevent her from changing cause he said he would miss her ("Bea Becomes an Adult Fish").

Oscar carved "O+B" into a tree when he was little ("Bea Saves a Tree).


Oscar and Bea Holding Hands.

Randy Pincherson also has a crush on Bea, which annoys her, making Oscar jealous ("Dollars and Fish", "Milo's Big Idea"). When Albert Glass was the one person in school who didn't like her; Oscar constantly kept saying he liked her only for her to ignore him every single time. ("Fishing For Compliments: The Albert Glass Story").

In Oscar's medieval dream, he dreams he is a knight that has to save Bea, as if she were a princess, from a dragon fish ("The Tale of Sir Oscar Fish").


Oscar is sort of terrified of Clamantha, partly because she has a crush on him. During his "fake date" with Clamantha, she drove him to Lover's Tank and he was stuck with her until Bea and Milo rescued him.


One time he convinced her that his laptop was another clam named "Webster" by typing in conversations from his computer for it to have with Clamantha via a computerized voice. Eventually "Webster" ran out of battery causing her to believe that Webster hated her and dumped her. Oscar ended up going to her room and cheering her up by telling her that she had a heart of gold and was a good person, meaning that he does care about her to an extent despite being very scared of her ("Two Clams in Love").

Bea at one point noted that she used to think Clamantha's crush on Oscar was cute but now just sad, meaning that Clamantha's feelings for Oscar have gone on for a while.



In Season 2, Oscar fell in love with Angela, with the feeling being mutual, and started dating her. After this episode, he often proclaims that he has a girlfriend, making it official in "Guys' Night Out". They break up in "Fish Prom", after Oscar tries to ask her to dance and accidentally calls her "Bea". In the third season, Angela becomes Jumbo Shrimp's girlfriend, and her first appearance in this season ("Unresolved Fishues") showed she was still angry with Oscar about their breakup. Oscar tried to apologize by writing a message in the sky saying, "I'm sorry Angela," but the message accidentally said "I love Angela," and Angela got the wrong idea. This caused a scandal with Jumbo Shrimp, so Oscar ends up apologizing to Angela while Jumbo beats his face. Angela finally accepts his apology and now, they are friends.


The image gallery for Oscar may be viewed here.

Background Information


Original Oscar

  • Since Milo and Oscar are the same age and do not look a thing like each-other, it is possible they are stepbrothers or one of them is adopted. However, it is possible that Milo inherited more betta fish genes than Oscar did (Milo looks more like a betta fish) causing this difference.
  • Oscar and Milo have yet to have their last name disclosed.
Oscar cowboy

Oscar as a cowboy.

  • Oscar knows how to fly a helicopter ("Good Morning, Freshwater").
  • In the original design of Oscar, he looks much different.
  • Clamantha has a huge crush on him, but he does not return the feelings.
  • Oscar only blogs when he is upset. ("Funny Fish")
  • Bea told Mr. Baldwin that Milo and Oscar do not have a dad. ("Glass Man Standing")
  • He has acrophobia.
  • According to Noah Z. Jones, Oscar would study "Fish Physics" when he goes to university.
  • His voice actor, Justin Roiland, is known for creating and voicing the title characters of the adult animated series Rick and Morty.
  • According to his human self, he sweats a lot because he wears six shirts ("Pool Party Panic"), but this may be wrong because he states in "Fish at Work" that it is a genetic thing and he can't control it.
  • He is naturally good at parenting ("Assignment: Babies")