Here's the reason Bowser's voice has changed to much: not all of his voice actors are human beings.
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SOURCES
- https://www.gamecubicle.com/interview-super_mario_sunshine.htm ("Cinematic" Quote)
- https://www.facebook.com/1398667830277775/videos/1408760295935195/?v=1408760295935195 (Interview with Scott Burns)
- https://www.youtube.com/watch?v=yqCfiDlig7c (Interview with Kenny James)
- http://www.gamespot.com/gamecube/action/supermariosunshine/review.html (Reviewer’s Quote)
- For sources relating to the SFX libraries, check the description of that video.
CREDITS
Mario Kart Wii Footage under creative commons via
https://www.youtube.com/watch?v=jUd9QvMAU9s
MUSIC
All music via Epidemic Sound