Your side effect is super cool, specially if you imagine that even light would be frozen in time. People in this thread keep choosing side effects that would ruin the super power but this one would be a problem but still worth using the power. With some practice you might even overcome some of thrle drawbacks.

Now I want a super hero with this power and side effect

Oh man that's a good one. So much for driving all those vacant Ferraris

This is far more insidious than it seems.

That would basically mean whenever you stop time you are locked in position.

Also photons cease to exist once you move into their space, there would be no light to enter your eyes attoseconds after stopping time, meaning you would be blind.