One thing that is important here which you'll note is that these injuries scale both with the current, and the future power of the champion. If you have a gangrene hand, or if you have amnesia, it is not something that can be overcome by finding a pair of bracers with +1str or witnessing a fight. It's going to be with you for a very long time.

I don't want to see buffed injuries before we see nerfed champions, particularly since the AI is currently quite bad about hero management and often ends up with a debilitating list of injuries already

Also, the incapacitation time becomes very significant as your heroes rise in level, long enough to knock them out of contention while an AI can (potentially) take down your cities.

Something to keep in mind is that if injuries are too crippeling, they simply create the "reload save before battle" impulse that a dead champion has. A champion that becomes effectively useless after one or two lost fights might as well be dead. 

Until the AI managed his Champions well (enough), having penalties that are not severe doesn't seem so bad. Right now it's more than common that all the Champions used by the AI have always at least one... and I have seen more than one with more than a row of them.

That solved, I would like a variety of injuries that range from cosmetic ("Oh, I got lucky that only got a scar") to something really crippling. But most of them being something in the middle.

I would like some possibility for casters to lose a level of magic in some element (Elemental Imbalance or something) or some kind of penalties related to the magic that he can use. More mental stuff too (a paranoid governor or a paranoid general).

The reload/save issue is completely up to the player. We shouldn't make the game unbalanced or non-challenging because some people cheat. But of course; The AI has to be able to deal with it too (or cheat for less impact of the maluses).

As the poster above me mentioned, the way it works now is too exploitable.

Agree. Save-scum is just cheating in my book. If you want to reload every time 10% of your faction is set back 20% in 10% of its utility, be my guest. Maybe you can give your champions some free levels as well, yeah?

Seriously, you cannot balance a game around save-scumming. There are 1000 other scenarios where save-scumming can save you in this game. Why should THIS particular feature be limited by it? No.

... how do you get an injured champ? only seems to see them when the battle is lost.

Fair enough, maybe I overdid it a bit. Even 3str would be better than 1str. It wouldn't necessarily scale with progress, though, but still something you can feel.

How about that some battle scars could give positive traits as well as negative ones? Any real warrior has battle scars! Maybe your hero could get something negative but your army could get something positive. A real battle commander should not shun away from a real fight and will sooner or later get a scar or two, would not your soldiers see that as a good token?

I for one think that this could be a really cool thing, a hero who has lost a ear or two or something else but who´s men believe in him since he never shuns a battle and never retreats. Who would you rather follow into battle? And old seasoned veteran of many battles with several scars to show for it or a clean crisp knight with not a scratch on him?

I feel there should be injuries, not all, but some, that resemble this:

I think stronger injuries would be a mistake, because they would hurt the AI more while the player loads the last save.

I just have to say that I strongly dislike the save and reload agruments that pops up everywhere. If someone wants to save and reload to make the game easier, then so be it.

Game developers should NOT care about this at all. I only reload if I misclick a button that I did not intend to click. I dont want FE or any other game to be made easier to play, cause people can just reload bad desicions or bad luck if they want to. If I do a gamble (a risky attack on a big monster) and fail, then I want to be punished for it. I dont want a slap on my heros wrist and continue to play with no consequence.

Just had to vent this in no general direction

There are 10 000 other scenarios in this game where a reload can save you from certain doom. Why should this logic apply ONLY to injuries?

Did you know you can LOSE BATTLES in this game? That's a feature a quick reload will save you from. WE SHOULD REMOVE THE ABILITY TO LOSE BATTLES!!!!!!