I wanna recreate something similar to this picture where the it fades out to blue at the corners:
You should use a decal/texture for that.
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Decal texture if you want a solid gradient.
If you want to make your own you can do so for free in your browser with tools like
(if you need a more in-depth of how to do this let me know~)
From the image, it looks like the character has some sort of radar.
If you want a radar effect use a flipbook particle emitter, and mess with the orientation so it’s always facing up.