Well, I can give my top three, plus an honorary mention or three.
Dom DeLouise for one is legendary, far as I'm concerned (RIP, though it's been years o7)...
...
Kath Soucie, who I prefer over Tara Strong and who has also voiced a bazillion characters, is also great (and still alive at the time of this post)...
...And,
Peter Renaday will forever be the greatest voice actor for Master Splinter (RIP as well o7)...
...Honorary mention to
Ken Page as well. He'd passed away as I was finishing up a retrospective / video essay / memefest for the original All Dogs Go To Heaven. RIP as well to him o7
EDIT: Also
Tress MacNeille (Gadget from Chip 'n Dale Rescue Rangers, Babs from the Tiny Toon Adventures) and
Lara Jill Miller (Hikari from Digimon, Haru from Beastars). I haven't heard more of their stuff beyond the roles though. I don't feel like adding pictures for these two.
It's kind of a shame my three favorite male VAs are deceased, though my top three female ones aren't. Something something, women living longer than men...?
EDIT 2: Someone mentioned
ProZD / SunWong Cho, and I agree. Dude's got great range!