Shader
For such a game graphics/toon style your shader looks promising.
I would replace the Principled BSDF with a simple Diffuse BSDF and the Fresnel with a Layer Weight node, plus a Color Ramp for more control. The Pointiness group just adds some color variation to the base color.

Lights
For the lights try a so-called "tri-point lights" setup. Blender comes with the add-on "Lighting: Tri-lighting" that creates and places three lights for you. Activate the add-on in the preferences. Of course, you can add another light or two if you want.

Experiment with the position, the strength (3x 150W, 400W in the example), and the color of the lights.
"Sonic Suzanne" (Cycles)
