You do realize that here in 5e all prof in a skill gives you are more +s on the roll, right?
That said, it's an amusing exercise to see how you can get them all.
How about this exercise: build a 20th-level character with maximum possible bonus to Initiative rolls.![]()
Rolled stats or point build?
That was similar to what I came up with, but I did only War Wizard 2 and Fighter 10. Same result, though.
Now try this one: End-build with greatest Speed per turn (consistently, that is, so +10 move for first turn, etc. is not applicable).
Edit: Be a Champion; +22 Init mod
Now try this one: End-build with greatest Speed per turn (consistently, that is, so +10 move for first turn, etc. is not applicable).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.