I am considering the following changes to Fighters and would like to get some feedback:
Hit Die: D12
Extra Attack: 4th, 9th, 15th
Indomitable: Goes from a re-roll to an auto-success.
Champions: 5th level: Free Savage Attacker feat.
Champions: Remarkable Athelete: Add your entire proficiency to Str, Dex, and Con checks that do not already include it. Increase your vertical and horizontal jump by 1X Str Mod for standing and 2x STR Mod for running jumps.
Eldritch Knight: Choose any two schools.
Battle Master: At 7th level, you can expend an additional Superiority Die on a maneuver.
I am all for giving Fighters nice things. My preferred nice thing is opening up their flexibility rather than giving them more combat goodies...but on your choices, point by point.
Hit Die: D12
Not necessary, and steps on a Barbarian's toes.
Extra Attack: 4th, 9th, 15th
I like this idea, though I want to expand it a bit. The fighter's main schtick--the thing that supposedly sets him apart from everybody else, doesn't actually pull ahead of anyone until 11th level (and even then the other classes get an equivalent feature). Other than giving the 4th attack at 15th level, when it will actually do a bit of good for a player, this won't do much.
Indomitable: Goes from a re-roll to an auto-success.
Perfectly good idea, but I'd prefer to just get rid of the usage make it always on advantage on all saving throws.
Champions: 5th level: Free Savage Attacker feat.
Savage Attacker is a lame feat. How about increasing all weapon dice one step?
Champions: Remarkable Athelete: Add your entire proficiency to Str, Dex, and Con checks that do not already include it. Increase your vertical and horizontal jump by 1X Str Mod for standing and 2x STR Mod for running jumps.
No need for this (and steps on Barbarian's toes), but doesn't hurt anything. You should never, ever have ability checks that can't be modified by some proficiency anyway. It screws up the math.
Eldritch Knight: Choose any two schools.
Why not just remove the school limitation?
Battle Master: At 7th level, you can expend an additional Superiority Die on a maneuver.
Is there a rule you can only expend one superiority die? This doesn't actually help the Battlemaster much. It just runs them out of gas even quicker.
More flexibility is needed, not less.