A Lava Man is seen walking through the Fire Kingdom in "Incendium." Notably, another Lava Man was mentioned to have been blocking Finn and Jake's home in "Prisoners of Love," however, early storyboards for the episode reveal that it was a different Lava Man, and looked very different. Jake also mentioned a Lava Man in "Morituri Te Salutamus" while singing "On a Tropical Island."
Lava Man is made up of dark-violet volcanic rock that is as big as the Fire Palace. Part of his forehead is covered with lava that comes from the upper part of his head. His eyes are holes and fire comes from them. His mouth is a classical Halloween-pumpkin mouth from which lava oozes from. His legs are little and his arms are as long as the rest of his body with cracks exposing some magma. His arm are longer than his legs and drag along the ground as he walks.