UngeheuerLich
Legend
GWM+PAM+SENT+HAM combo
Assassin:
Elven accuracy or gunner + sharpshooter + piercer
half orc barbarian;
orcish fury + tanarukk blood + GWM
wannabe caster:
Magic initiate + telekinetic + telepathic + fey or shadow touched(or both)
leader/healing support
Inspiring leader + healer + chef(maybe)
not to mention if you want to take some feat that is not optimal for build... 0 room for that.
or just ban few feats from being 1st level:
GWM, PAM, HAM, SS, CE
rest are not really any problem.
Thanks for the elaboration.
Now I know what the difference between your assessment and mine is:
I don't consider half of those character concepts but specific builds.
The first one for example works fine at level 1 and becomes more powerful with each feat. The concept is realized at level 4 when you got polearm mastery or sentinel.