There are two parts to this post.

First, when I'm hovering over an enemy or friendly in combat I want to see a tooltip with what traits and magical effects are applied to the unit. This should appear when I'm trying to select a target to attack. Currently, there is a way to make it appear by hovering over the unit action list. This makes no sense, I'm not going to drudge through that list to find my target. This tooltip should appear when I hover over an enemy on the map. Either next to the mouse or near the bottom right corner of the screen. It is every bit as informative as this crap and includes other information I actually want to know as well. This will also help make traits more visible in the game - right now they are practically hidden and can for the most part be ignored anyway. You actually had a tooltip like that back in the day in FE, but after some bad design decisions you relocated it to the obscurity of the unit action list. Obviously only combat-relevant traits should show up in the list of traits, but I believe you already have an XML tag for that. This is what the final result might look like.

Second, for champions the unit details window quickly becomes swamped in icons. This is just at level 4. Abilities that are visible in the Skills tab should not appear in the previous tab.

(Looking at the combat UI, I also realise I have no way to know what any particular magical effect is doing to any unit. I can't access the encyclopedia from inside combat. Pretty important to have that information accessible.)