Thanks for the detailed feedback.
Potions can only be used in combat by characters with the logistics skill. I'm planning to add more items in the future and potions will have a particular advantage over magical healing too so I'm hoping this limitation will make more sense in the future.
Adding tooltips to skills is a good idea. I can't expect everyone to remember what every technique does. A button to highlight all hp bars is good too.
Your interpretation for all of the characters is pretty off the mark but that's ok too.