Side effect: your voice cracks in an absurd way every time you use this power. Both parties find it too funny to continue fighting. They instead laugh at you.

It only works when your eyes are closed.

What's funny is that the most obvious side effect to this is the most realistic: molecular manipulation in this way causes an incredible build-up of energy that either expresses as kinetic or thermal, depending, and almost always exponentially explosive from the moment you turn time back "on"... to say nothing of the disastrous effects at the fringes for such time-stop powers...

tl;dr: The Flash would've incinerated the entire planet long before he discovered how to keep from glassing it simply by practicing his powers.

Air particles also frozen

Wherever you leave from instantly goes to war.

They (the place ) can no longer stand you and you can never stay in a single place for more than a day.

Now you can also speak and translate the languages of the trees and the rocks and the inanimate objects all around you and you have no way to get them to shut up.

You were born without fingertips and can't do biometric scanning. No one will give you a passport.

Only while asleep

But you make all people in your vicinity happy, too.

Swallowing pills is extremely difficult, and can only be roughed down with a semi chicken dance shuffle that involves hopping and takes 4 minutes too long for anyone noticing.

But Everyone loves you. Oh... wait....

It's all rotten.

You keep accidentally making random people's heads explode.

Side effect: you have a vision of the first move they'd make after taking your mom/dad on a date

you are extra susceptible to suggestion, don't turn off your adblocker ;)

You can only do it with extreme violence

Side effect: you have a premonition of exactly what their bowel movement will smell like as a result of whatever they eat due to their hunger

Side effect: you still age at your regular rate.

They transfer to you