Even though Bowser is very fun right now and we are out of space, I just want to make my only 2 suggestions for him for the future.
Buff his nair a little bit, less landing lag is the number one choice I see to do this. His nair often get's you smacked back after its use, and links to pretty much nothing. It's pretty much useless.
Have his dair "spike" a little bit. What Kirby's dair does, have it do that but to a smaller extent. Basically, I guess I'm asking to have the downward knockback on the dair increased when the person receiving it is in the air. This way Bowser's off stage game would be better, and actually less predictable (as right now it's pretty much only bair near the edge, and fair [pulled off a few uairs successfully before too but it's not viable]).
I know these suggestions are pointless at this point in time and probably until GeckOS 2.0, but still. If these 2 things are done to Bowser, I think he would be pretty much... perfect in my eyes.