Skulls are boys capable of wielding mysterious powers and enter into magical academy at a young age, devoting themselves to their studies. Only those who can prove themselves through harsh courses and competition are granted the trademark skull hood and glasses, which are designed to increase their concentration. When their concentration is at their peak they enter a trance like state, noted by them making odd noises, and can harness concentration power over 200 Polgia. Due to their upbringing, they are more studious and serious than Mages.
They can learn magic spells corresponding to their aligned element, but some can learn spells from all four elements. However, the ones aligned to a specific element are more easily able to learn the most powerful versions of their spells.
They have the ability to learn magic spells like Skulls. In Disgaea 2, they learn spells at a lower level than Mages. From the second game onward, Mages use less SP for skills and starting in the third game, Skulls use more SP for skills but deal more damage than normal, meaning that there is a choice given to the player in which they can either use Mages to not burn out on SP as quickly, or use Skulls to deal the most damage but burn out SP quicker.
- Main article: Skull (Disgaea)
Skulls were introduced in Disgaea: Hour of Darkness as one of the starting classes.
- Main article: Skull (Disgaea 2)
Skulls return in Disgaea 2: Cursed Memories as a starting class and also received a redesign of their former appearance. Rather than covering their faces with a mask, they instead wear it on their heads, revealing their boyish appearance.
- Main article: Skull (Disgaea 3)
Skulls appear in Disgaea 3: Absence of Justice, again as a starting class.
- Main article: Skull (Disgaea 4)
Skulls appear in Disgaea 4: A Promise Unforgotten, again as a starting class.
- Main article: Skull (Disgaea D2)
Skulls appear in Disgaea D2: A Brighter Darkness, again as a starting class. A new feature when creating Skulls involves choosing their Element forte. Doing so will allow the Skull to learn spells that normally in previous games, would only be usable by a specific colored-Skull. Hence, creating a Red Skull who uses either Wind or Water magic rather than the usual Fire magic is a possibility.
- Main article: Skull (Disgaea 5)
Skulls appear in Disgaea 5: Alliance of Vengeance as a starting class. Like in Disgaea D2, a Skull's elemental forte can be chosen regardless of tier.
- Mage, the female counterpart to this class.