Physical Appearance
The body of the ghosts are transparent and the eventual clothes they wears are translucide but not as much as the body. Spooks with the white sheet is completely opaque and usually, this sheet never leaves them.
Ecology
If a Spook has a white sheet or not is determined by the child's funeral. This sheet offers more chances to the Spook to enter the Spirit dimension and therefore, rest in peace.
The sheetless Spooks are either children who did not have a proper funeral or children who's body were never found. They can still reach peace, but it requires an external help and thus is way harder to achieve.
Diet
Being Ghosts, Spooks do not need to eat in order to survive.
Habitat
Spooks wander in any type of environment but they are found mostly in cities and even more at playgrounds.
Rarity
Common
Behavior
Spooks are little tricksters, they like to wear their white sheet and make themself visible to spook people, hence the name.
Being the spirits of children, they still mostly want to have fun. This is why they're easily found at playgrounds. If you see a swing swinging by itself, there's a chance that it may be a Spook playing!
Threat level
★ ☆ ☆ ☆ ☆ ☆ - Harmless: Can cause little injuries but no more than a scratch. Can be taken care of easily and without magic needed.
Abilities
Spooks have no magical abitilies. They are able to show themself in the real dimension and interact with objects there but nothing more. The white sheet is supposed to give Spook more accessibily of the real dimension.
Magic
Except for interacting with the Real dimension's objects, it is unknown if Spooks are able to manipulate mana and display spells.
Use
Being ghosts, Spooks have no use in any spells or rituals.
History
If a Spook has a white sheet or not is determined by the child's funeral. This sheet offers more chances to the Spook to enter the Spirit dimension and therefore, rest in peace. Usually, the white sheet never leaves them.
Legend says that if someone finds a white sheet on the floor in a random place, it means that a Spook has finally found its way to the Spirit dimension in order to reach peace, or has lost all hope and turned into a Shade.