|Eye color||Black and Red|
|Enemies||Neddy the Mallet|
|First Appearance||Cleanliness Is Next to Grupliness|
|Latest Appearance||Gotta Get Grup to Get Down|
|Voiced by||Luke Sienkowski|
Skullivan is a humanoid skeleton. He wears a knight garb, which includes spiked shoulder pieces, blue clothing with a belt and a single X across it, purple pants, and purple gloves. He has a long neck, red pupils, and a single hole on each side of his skull.
Skullivan has a laid-back, calm but cynical demeanor, often conversing with his friends. He is openly passive-aggressive, and does not hide his low opinion of those around him. He is extremely unhappy with his position as a bottom-rung dungeon monster and is in a constant state of depression and ennui. He always goes along with all the other monsters because he knows he won't get his way.
In his first appearance, Cleanliness Is Next to Grupliness, he has a chat with Lady Hiss. The two became disgusted by Grup's smell and instead of telling him, he decided to cover his nose with a jarham. However the ham gets stuck to his nose hole.
- Despite being an undead skeleton, Skullivan is still able to eat and taste. He also retains his sense of smell.
- Skullivan mentions more than once he was alive at one point, making him previously human.