Kobolds are evil animals, related to goblins. Kendra saw one in Rise of the Evening Star. His name was Casey Hancock and appeared as a strikingly handsome boy. Only Kendra could see him as an ugly Kobold. He had a bald head, rancid breath, and wooed some of Kendra friends out on dates.
The Journal of Secrets explains that there is a magical pond somewhere on Fablehaven where a treasure hunter can capture a Leprechaun. Brandon Mull stated at a meet the author event that he had worked a leprechaun into book 5.
A Leviathan is one of the figurines that Thronis, the sky giant asks Seth to recive for him from the Dragon Temple. Once placed in water, the figure will turn into a real Leviathan and be obedient to the one who placed it there.
Milch Cow
Every magical preserve has one of these amazing animals, which in everything but size, appear like normal animals. However, they are enormous. They are magical beings that create the milk the fairies drink. It is this milk that allows mortals to see magical creatures. The milch cow at Fablehaven is called Viola. The Lost Mesa magical preserve has a similar but larger cow called Mazy. On a magical preserve in Greenland, they have a gigantic walrus that produces butter that has the same effect as the milk.
A creature that is part man, part bull. These make appearances in the second, third, and fourth books. In Rise of the Evening Star, Warren fights one who is placed to guard the way to the artifact in the inverted tower. In Grip of the Shadow Plague, several are stationed to guard Kurisock's domain at the battle between light and dark creatures. In Secrets of the Dragon Sanctuary, a minotaur is one of Agad's servants at Blackwell Keep.
Or Water Nymphs. Beings that live underwater who live a life of mirth and frivolity. They dwell in the pond surrounding the Fairy Queen's Island Shrine. The naiads love to make fun of anyone else, and drown humans for fun. Lena, the housekeeper, is a former naiad who became mortal when she joined Patton Burgess and became his wife. She later was restored as a naiad at the end of Book 1. Some names of naiads in the series are: Chiatra, Narinda, Ulline, Hyree, Pina, Zolie, Frindle, and Jayka.
Nipsies
Nipsies are related to brownies, but are only a quarter inch tall. They live in seven kingdoms and build their cities using natural resources. They have little magical ability, but they adept at cultivating poisonous plants to protect their domain. They are the first creatures affected by the shadow plague.
Typically big and clumsy, though smaller than giants. They are known for devouring their victims. A female Ogre, or Ogress, chases Seth and Kendra when they're caught stealing stew from her pot in book 1. Kendra glimpses a humpback Ogre in Blackwell Keep in book 4.
