I have noticed that Bowser's animations transition from the Mario & Luigi RPG series sprites and sprites that have been traced from the Smash Bros series. The end result looks... very awkward to say the least but I do have a suggestion that would make Bowser a more visually appealing character to play.
This may come off as controversial but why not rework Bowser's moveset into a gameplay style that better reflects how he plays in the Mario & Luigi RPG series?
It would allow use of sprites and animations from said games and give Crusade's Bowser a truly unique flavor and gameplay style. ( The Final Smash doesn't need any changes as Bowser makes use of a giant-like form in those games as well. )
Ganondorf received a completely unique moveset that sets him apart from the main Smash Bros. series so why not Bowser?
Let me know what you guys think, I know a complete rework would take alot of work but I truly believe you guys are up to the task and it will be worth it.
EDITIf a full rework seems too ambitious, please consider replacing the melee traced frames.
For example, his side smash could be a charged up punch.
Neutral Jab replacement: