Post Closed as "off-topic" by WillO, Bill N, Kyle Kanos, M. Enns, ahemmetter
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Exceeding the speed of light

I understand that the speed of light c is derived from the self-interaction between elections/photons, and is thus the maximum speed of anything composed of electrons/photons.

Suppose that there is a particle that is made up of stuff that is not electrons and photons. Is it possible in principle for this particle to travel faster than c? Or does c somehow apply to absolutely everything in the universe, even as yet undiscovered particles?

If it has already been proven that c applies to absolutely everything in the universe, even as yet undiscovered particles, then c is really a property of space itself, rather than a property of electromagnetism.