ROWLIE:

Instead of normal light in his eyes, he will have ultraviolet light. This is because he was a cleaning rat, so he used the light to eliminate bacteria from the places. In the game, you can't look at his light, otherwise he will blind you and kill you. You can protect yourself from the light with red lenses or sunglasses.

Cheester:

It will have an infrared light. It won't blind you or anything, and you won't be able to see into its eyes either, just with a camera. But it can kind of control any electronic device with this light. To block,you need to inhibit the signals with glass, plastic and metal. He has this light because he is a magician, and every magician has his tricks.

Fluffy:

She has X-ray,She can see you even if you hide. She can also blind you and the light is also not visible. To prevent her from blinding you, you wear glasses, but even so she can cause you problems. You can't hide from her. She has this light because she used it to look for people with her "sense"