Finn Mertens

Finn Mertens, short for Finn, also known as Finn the Human, formerly known as Pen in the original short before Cartoon Network picked it up for a full series in 2010, is the main protagonist of the series Adventure Time.

Another Way
Due to having injured foot, Finn spend the whole episode wearing one shoe while the other one is wearing a cast, after getting heal by the magical teardrop and takes off his cast.