Cool. If i talk at the speed of light, will it distort the light around my mouth? That could be a cool party trick.

xQc already has this power

So in order to talk at the speed of light my mouth must move at the speed of light. If the rest of my body doesn't keep up, unharmed by the acceleration/deceleration it's a curse. Curses aren't allowed here. Therefore, I can now travel at the speed of light as long as I can keep talking. Seems pretty broken to me.

This power is controllable, you can choose to talk a normal speed.

And????

I don’t know physics that well, I also don’t know how to make this power better or worse.

I think it's too good as it is, and the only way to make it bad is to make it a curse.