Mana vs Energy vs Rage vs Mana(less) vs Health
Lets start with mana-less.
Mana-less champions seem to be very powerful and are able to do whatever with no care because they can miss and come around and just try again with no risk. Now, I'm not saying "nerf the abilities" because I'm not. That's not the point.
Rage.
Now, this is the same as mana-less but with an added extra. Even Rumble's heat is like rage. These champions can send out abilities as well with small regard because they are reusable. But, they (or at least 1 ability) can be enhanced with the rage.
Health
There are not many champions that use health like it's mana. But, the ones that do need major benefits to allow them to survive. Vladimir gains bonus health and a free health regain, Aatrox also has a free health regain and revive, Mordekaiser gets a shield that blocks anything, and Zac... gets blobs and a revive. Now, these abilities are hard to manipulate, but they should be at least treated like Energy champions. That means that even Zac should deal more damage or have more sustain, and right now it seems he might do better with more sustain. Health champions sacrifice their own life force to fight, and that in itself is risky.
Energy.
There are only 5 energy champions and yet their energy is very limited, it is easier to gain back rather than mana. Shots and abilities are fine, yet Shen seems to be on the weaker end. (Riot, what is it with you and tanks?) And they should deal more than any so far, but...
Mana.
These champions rely on a certain amount of given MP to use their abilities, and it is limited. They cannot just use abilities like a mana-less or even a health champion. Yet, majority of mana champions have had to have their abilities reduced in power. That doesn't seem to right. I've been seeing too many posts so far on how mana is so hard to gain back, and that all the above have major advantages. The thing is, for the champions that have low win rates, and majority of the mana reliant champions, should gain from small to major buffs. With every nerf you bring in every patch, I see further and further that you guys aren't even trying. You never even consulted the people from the PBE. We, who are not on the PBE, also see these changes and say, show, and try to undo your nerfs. You call them "fair balance changes" yet I call them "unneeded, misguided, and just irrational changes that you make just because you don't want to do something with that champion". I understand, though, because it was a champion from way back in the early days of LoL. But, what I would do instead is make sure that I "balance" the power of a mana champion compared to a mana-less champion.
Please fix.