Finn the Human is a 12-years-old hero with an awesome hat and a penchant for shouting math-related exclamations (despite being bad at the subject itself). Finn has an irresistible urge to help others no matter what as a result of not being helped as a child. Finn has a poorly-hidden romantic interest in Princess Bubblegum.
In the original short aired on Nickelodeon, Finn is voiced by Zack Shada. In the main series on Cartoon Network, Finn is voiced by Jeremy Shada.