I feel like I have "old eyes" sometimes when I'm playing this game. The battlefield can get extremely BUSY with floor effects and fire and clouds and trees and at first it was very hard to find people. I could always find them, but its hard to get an overall visual map of what is happening, especially in tight spots.
I turned on all the character markers in the options menu. You can also click on the enemies etc in the top initiative bar and find everyone.
I'm not complaining too hard, but I wish the characters were a little more... Cell shaded almost/outlined?, like easier to pick out from the backgrounds and effects.
I can say that you kind of get used to it though, after a couple hours of playing.
Rejuvinate your eyes...;) Remember, this is turn based so you have an infinite amount of time when it's your turn, to:
1) Zoom in/out using mouse wheel
2) Move your cursor over fire/steam clouds, etc. to highlight your players and enemy players automatically
3) Rotate the camera 360-degrees or any fraction thereof to see the scene from any angle you choose
This is how the game is intended to be played, and using some combination of these methods should reveal everything you need to see during combat.