Thought-Forms are living entities that primarily inhabit the "astral plane", they are thus akin to "living ghosts" and may either be the result of meta-human mutation, magic or even the collective will of others.
When created by other characters they are usually refered to as a "tulpa" and are in essence of "imaginary friends" that have gained sufficient intelligence and awareness to be considered a living entity.
Alternatively, they may not be real beings at all but psychic energy given life (or the illusion of life) by some powerful force. Sometimes they are simply created inside a real character's mind and only exist within their heads.
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