Volunteered to help
@LordWilliam1234 write up Frame advantage on block with 1.11's new shieldstun and shieldlag numbers. So I of course started with
Bowser. Note that with aerial moves, the assumption made is that you connect an attack just one frame before landing, and suffer that move's landing lag as they suffer shieldstun. It's a very "Sheik" way of looking at block advantage, but the numbers aren't that terrible for Bowser's heavy moveset. I did look into some other things though:
KuroganeHammer
Assuming his jumpsquat is 8, Bowser's shorthop height is 34 frames before landing
Utilt - block advantage improves by up to 5 when connecting the back hit of the move instead of the front.
Nair - if you land just after frame 18 when the leg hitboxes become active, and they both connect on the target's shield for a 12% hit, the advantage should be -6/-13
Fair - shorthop auto cancel height, frame 13 hit, 6 frames hard landing lag = -11/-18 advantage
-Autocancel window is frame 31, thus the player can delay Fair up to three frames during a shorthop to still autocancel, and have advantage improved by just as much.
Bair - shorthop auto cancel height, frame 9 hit, 6 frames hard landing lag = -12/-19 advantage
-Autocancel window is also frame 31.