They will always have a power core located on their chest, like a gem of sorts. It is the source of their life force, and can last for up to a century before it runs out of power!

That power core will run lines through their body, of the same coloration; the eyes will also have that color! It casts off a faint light.

The lines will never be darker than the main fur folor.

color*

There will be small points in those lines that act like hubs for energy, channeling data and such.