1. Púca: Mischievous fairy-like beings, often associated with horses and appearing in various guises, including a black horse, a goat, a dog, or a rabbit.
2. Morrígan: A supernatural figure associated with war, fate, and prophecy. Often depicted as a terrifying warrior woman or in the form of a crow or raven.
3. Banshee: A female spirit who wails and cries before someone's death. She typically appears as a pale woman dressed in white or gray.
4. Selkies: Mythical beings that can transform from seals into humans by shedding their seal skins. They are often depicted as beautiful women or men who attract humans, but ultimately long for their seal nature.
5. Cu Sith: A spectral hound or dog-like creature with otherworldly powers. It is often associated with death or misfortune.
6. Each Uisge: A water horse that inhabits lakes and rivers. It often takes the form of a beautiful, enticing horse, but its touch is fatal for those who ride it.
7. Bean Sí: A female fairy creature who is typically benevolent towards humans. She can take on various forms, such as a beautiful young woman or an old crone.
8. Dullahan: A headless horseman who rides a black horse and carries his head under his arm. He is often associated with death and foretells calamity.
9. Fir Bolg: A race of supernatural human beings who are said to have inhabited Ireland before the arrival of the Gaels. They are often portrayed as strong, skilled, and knowledgeable.
10. Fomorians: A group of malevolent supernatural beings often depicted as rivals or enemies of the Tuatha Dé Danann, another group of divine beings in Irish mythology.