Main Characters
Kenny
Voiced by: Jim Conroy
Kenny is a tiger shark and is the main protagonist. He is able to walk on land like humans.
- All Animals Are Dogs: Kenny has tackled and licked Kat like a Big Friendly Dog as a show of affection to her on multiple occasions.
- Berserk Button: When something interferes with his feeding, Kenny gets noticeably more irritable.
- Big Eater: Oh very much so. His eating habits become a problem for Kat's parents, as one episode was about finding a job to pay for his food bills. He and Kat settle for a mascot job for the local hockey team, where it turns out they aren't paid with money but with all the hot dogs he can eat. He's not fired for causing panic, but because he ate all of the hot dogs.
- Four-Temperament Ensemble: The sanguine. He's oftentimes impulsive, but is easily the most sociable and forgiving of the main characters. Plus, whenever it's made clear he messed up, he always tries to repair the damage done.
- Nice Guy: Despite what people think, Kenny is actually a pretty decent guy when he's not chasing seals.
- Papa Wolf: Messing with Kat, especially if Kenny is present, is a bad idea. Case in point: in "Whaling on Kenny" which features Kenny's "friendship" with Buster the orca, Buster had spent the entire episode bullying the frankly terrified Kenny. When Kat shows up and Buster knocks her to the ground, Kenny flips and launches into a speech that's half Not Afraid of You Anymore and half "The Reason You Suck" Speech.
- Parental Abandonment: True to how sharks behave, Kenny never met his birth parents. It sometimes makes him depressed. And also the reason he became close to a baby shark he and Kat encountered in "Kenny the Dad".
- Red Oni, Blue Oni: The red oni to Kat's blue oni. He is more active, and often impulsive, while Kat is more composed and (usually) thinks before she acts.
Katarina "Kat" Cassidy
Voiced by: Kelli Rabke
Kat is Kenny's owner, and is the deuteragonist.
- Beware the Nice Ones: Kat is generally easygoing and friendly, but threaten her, Kenny, or anyone she cares about, and you'll be sorry.
- Deadpan Snarker: She tends to be this, especially in season 2.
- Depending on the Artist: Kat has two hairstyles: one that is completely straight and one with a curl.
- Four-Temperament Ensemble: The phlegmatic. She is easily the most composed, even-tempered, and acts as Kenny's moral guardian. Even if she is irritated, she very rarely raises her voice. Even if she does, it's almost never to the point where she is shouting. Bonus points for her sarcastic moments.
- Nice Girl: She's laid-back, friendly, caring, and pleasant to be around.
- Red Oni, Blue Oni: The blue oni to Kenny's red oni. She is more composed and (usually) thinks before she acts while Kenny is more impulsive and energetic.
- Twofer Token Minority: Biracial (white and Asian) and female.
