Hi everyone! Iām currently working on a project and am trying to create this glow on my character, without losing any of the details and shadows. I already have the skin material applied through image textures & I want to keep those details. Would appreciate any advice, thanks a lot! 
That effect was probably done in compositing combining a series of glows and directional blur.
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Usually, after rendering, Composing uses Glare Node or uses a 2D editing program.
https://docs.blender.org/manual/en/latest/compositing/types/filter/glare.html
Alternatively, you can mix it with the Emission shaders to create a light-filled material. Even in this case, you should use the Glare Node to create a diffused light feel.