Blowfish

The Fugu Blowfish has only been seen twice so far, making it one of the most minor animals in the series. Every time it appears, someone gets poisoned.

Total Drama Island
The blowfish is used in the Extreme Cooking challenge in the Total Drama Island episode Who Can You Trust?, when Lindsay and Trent, for the Screaming Gophers, are up against Bridgette and Geoff, for the Killer Bass. According to Chris McLean, the fish contains enough poison to kill at least thirty people. They must be sliced very carefully to cut around all the poisonous organs. He also says that the poison paralyzes the nerves and there is no known antidote. Bridgette is able to successfully prepare the blowfish in the form of sushi, which she feeds to Geoff. Geoff is shown to not be harmed whatsoever by it, even enjoying the sushi a bit. Lindsay, however, prepares a mangled mess of a dish for Trent (whom she made to look tastier with a ketchup smiley face), who nonetheless eats it. After eating it, he collapses and convulses, having been poisoned by it. He survives the incident, but isn't able to participate in any of the other challenges for the day and seems to have a mental disorder for the rest of the episode.

Total Drama Action
The blowfish is next seen in Crouching Courtney, Hidden Owen when the girls have to prepare a Japanese dinner for the winner of the reward challenge. This includes a dish called Kung Fu Noodle Soup, which is made of vegetable broth, noodles, and the "seven deadliest species of fish known to man," of which the fugu blowfish is shown to be one of them. Beth claims she is allergic to fish when they're still alive, and therefore cannot help Courtney cook it. Courtney eventually manages to cook the dish, but it seems that she prepared it incorrectly, as Owen is poisoned after tasting the soup.

Trivia

 * Both times that the fish has appeared, it is used for a challenge, and needs to be cut up and prepared as a meal.
 * Both of the only two characters who have ever been poisoned by the fish are voiced by Scott McCord.

Gallery
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