Character Concepts: The Bonekin

Bonekin, The Keeper Of The Library:
    *Assumed Fae. N/A. Indeterminate.
    *5’4. Humanoid. Semitransparent grey film over blue-grey flesh and white bone.
    *Psychically manipulates the calcium in organic organisms. Can channel the life-force of organisms he touches into himself, or using himself as a conduit into other organisms and sometimes objects. Skilled close-quarters fighter, using his abilities and martial and athletic ability in cohesion. Also able to create brief illusions, including altering his appearance.
    *Purely close range. Form is vulnerable to damage; if the film covering his body is broken he loses control of the area beneath the break. Any illusion he had in place is also dispelled if the film is broken.
    *None.
    *Protects a library of artefacts from various times and universes deemed too dangerous to either destroy or keep in the universe of their origin.
    *Though certainly not benevolent, Bonekin is not malicious or cruel. He is not indiscriminate, exhibits a surprising amount of fair play, and is possessed of an almost archaic set of ideals. Also incredibly opinionated. Treats any who attempt to steal from the library with immediate and sure retribution.
    [Backstory: According to the legends of the mountain villagers, Bonekin guards the hidden treasures of the mountains.
They say that in return for something of value he will form a contract with humans, and that the complexity of the human’s request will determine the severity of the contract and the value of the payment. The most common payment other than items is the freedom to take part in the raising of the children, as he appears to share some connection with them.
If the human breaks the contract, some or all of their life force becomes the property of the Bonekin (depending on the contract) as well as whatever they offered. If the Bonekin breaks the contract then the payment is returned and the Bonekin performs another service to the human at no cost. Where the payment was to do with children, if the human breaks the contract their child is given to the Bonekin in addition to the life-force cost. If the Bonekin breaks such a contract then he bestows a time or blessing on that child in addition to the free service].

Author's Note

As generic as the template is, I felt that I had to make a 'Librarian'-esque concept. Although the role of these characters is usually fairly limited within the overall structure of a narrative or general plotline, it is often an important one; most often a source of learning for the main characters, to tie with the label.
The concept of Bonekin was inspired by a mixture of the Zulu 'Hili' or 'Tokolosh', a spirit of mischief and evil, and the western fairytale antagonist of Rumplestiltskin. When writing the concept it