i wish to create a halo behind one of my characters but i don’t know how to do it. i tried the halo button but it does not give me the effect i want.
Do you mean that the light shouldn´t go through him, instead showing his contour? If that is what you want then you need to mess with the samples and steps.
Please give us a little more info, of what you are trying to achieve.
Is it just a single halo, like a “lightglow” thing?
Then you have to play with Photoshop or Gimp.
I belive the effect you’re looking is called glow. Try working with blender nodes to get the effect.