are these all renamed and assigned to powers already, or would i need to go in and alter each one?
You just need to extract it to the directory, I've already pre-assigned them to all the sound catergories.
Characters will say things when you either knock around an opponent or when you kill an opponent, plus voice lines for a variety of other scenarios. (Level-UP, etc)
Plus new voice lines for when they use Xtreme powers.
So you don't need to do anything besides extract and replace

, let me know if you have any troubles.