Are there any electrons inside the sun / a star?
Plasma consists of ionised particles. The electrons are not bound to their nuclei and are free to move around within the star. 

However, they are not free to leave the star. Without the electrons to maintain a neutral charge, there would be massive electrical repulsion from all the positive protons and helium nuclei, the result would probably be something like the formation of a black hole larger than the observable universe... The "What if", blog considered something like this in Proton Earth, electron moon and concluded that it would be one of very few things that could actually destroy the universe.

In conclusion, the sun contains about $10^{57}$ electrons. One for every proton.