Is there such a thing as a good or converted2good demon scientifically No opinions beliefs etc involved?

Firstly, many people don`t believe in demons. It is said that if u dont`t believe in then you can`t see them.

I once saw a documentary on Discovery that claimed that a demon ( a house-hunting ghost) saved the people inside by entering their dreams and telling them to get out of the house because it is on fire.

So , as a conclusion,it is thought that good demons exist.