Finn Mertens

Finn Mertens is a fictional character from the show Adventure time. he is mostly accompanied by his brother; Jake the dog. He is the main protagonist of the long-running animated series Adventure Time. A brave, enthusiastic, and often reckless young hero, he protects the Land of Ooo alongside his best friend and adoptive brother, Jake the Dog. Core Character Traits Identity: Originally believed to be the last human in Ooo, his backstory is eventually revealed to involve a community of human survivors on a remote archipelago. Heroic Code: He is deeply committed to a strict moral code, vowing to help anyone in need. This often leads him into dangerous dungeons to fight monsters and save various princesses. Aging & Growth: Unlike many cartoon characters, Finn ages in real-time. He starts the series at age 12 and is 17 by the finale, eventually appearing as an adult and an elderly man in spin-off series like Fionna and Cake and Distant Lands. Notable Fears: For much of the series, he suffers from severe thalassophobia (fear of the ocean), though he eventually overcomes it to honor his idol, Billy. Key Relationships Jake the Dog: His closest companion and surrogate older brother. Their bond is the emotional anchor of the series. Princess Bubblegum: Finn's long-time crush and moral mentor. Their relationship evolves from unrequited love to a deep, platonic mutual respect. Flame Princess: His first serious girlfriend. Their relationship was a significant milestone in his emotional development, though it ultimately ended in a breakup. Marceline the Vampire Queen: A close friend and occasional mentor who shares his love for music and rowdy adventure. Production Details Voice Actor: He is famously voiced by Jeremy Shada.