Hopefully, all the basics are covered. If any questions, feel free to ask!

Species info for Grand Delusions (Closed species):
They are humanoid figures, but can vary vastly in appearance from one another.
They come into existence when an extremely overpowering feeling or emotion overcomes an individual, at which point they are 'called' into being.
They can have 2 forms, a stable form that is their standard form, and an unstable form that they take only in combative situations, though not all have this second form, which are called non-combative.
All Delusions have black collars around their necks that allow them to remain in this world. It cannot be removed by any means.
They have male and female shapes, but no reproductive organs or systems.
Their powers and abilities are set by the circumstances of their birth, such as fever, which causes them to have control over heat and/or flame.
Their horns are the hardened manifestation of what called them, and feel as such when touched. For example, fever Delusions' horns always feel hot. The horns cannot be broken, and are always symmetrical.