Phineas and Ferb

Phineas and Ferb are crossover characters.

In their normal series, they are known for building big inventions. In HTF, they also try to build inventions, but are usually injured or killed. Phineas is a red beaver while Ferb is a red bear.

Trivia

 * Phineas and Ferb haven't appeared in any episodes.
 * Ken Potac says that Phineas will likely die the most gruesome deaths in the series, almost as gruesome as Sniffles.