Can electrons reflect light?
Yes. Like CuriosuOne said, electrons are shiny. I kid ye not, google on electrons shiny. Metals are shiny because they have free electrons. Check out this question about the colour of metals, where Ali said a metal is are silvery because it "reflects all wavelengths specularly (more or less)". Also see this article by William Beatty. I read it some years ago, and this bit stuck with me:
"Here is a way to see charge directly: look at the surface of a wire. Metals look metallic because they contain a "fluid" composed of movable electrons. This electrical "fluid" is an excellent reflector of light waves, and it causes the surfaces of metals to act like mirrors. It's these same electrons which flow during an electric current. The "silvery" stuff of a metal is the charge."
Lately, I have been watching sparks while connecting my electronic devices and I can notice that electricity is kind of blue, and theoretically it's blue because it reflects blue wavelengths?? And that makes it a particle (like if I said that light is a particle because photons). So am I correct?
No, like CuriousOne said, that's down to the air, not the electrons.