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Fern (full title: Fern the Human, formerly known as Grass Finn, or the grass guy) is the result of Finn's Grass Sword and Finn Sword merging into one being. He makes his first appearance at the end of "Reboot".
Fern's original form took on the appearance of a humanoid figure composed of grass.
He later took on the embodiment of Finn the Human. The notable differences compared to Finn however, is that he's entirely made of grass, from his skin to his hair and clothing; he also has blockier proportions, and is barefooted with two pointed toes on each foot.
He originally communicated in gibberish-like words, an example being "Mwah!", but he soon learned how to articulate and hear normally.
As he was recently brought into existence, he doesn't understand much of what is considered right or wrong, and originally thought of himself as the true Finn, before he took on his own personality as Fern. His memories are those of Finn's, so he is going through somewhat of an identity crisis as a result. He is friendly towards Jake and Finn and has a happy-go-lucky attitude, though he tends to be aggressive when confused.
Being entirely composed of grass, he has the ability to change his appearance and shapeshift into any form he can think of in order to fight enemies. In "Do No Harm", he alters his hand into a grass sword to slice grass monsters in half with single swift strokes. He also changed them to huge thorny fist-like projections to beat up the Grassy Wizard. The main downside to these abilities is that being a body of grass, he can't eat like a human despite being able to taste, smell, and remember food.