(Fern was originally Finn's sword,until Finn accidentally broke the "Finn Sword" with the "Grass Sword" while fighting Bandit Princess,then it merged..creating "Fern"),he's like a clone of "Finn",but different..he doesn't breath nor eat, he's like a plan,he uses "photosynthesis" to eat,he just wonders around,trying to find himself..or who he is...he has a soft voice when talking,and has long green grass hair,with flowers in it,under his grass hat