Roy, Dr. Mario and Mewtwo have empty effect files and unused instant slot entries, and Mewtwo has an empty sfx file entry.
Neither the removed Melee characters nor the rest of the 'Forbidden 7' have a .rel (module) file (or anything 'useful' for that matter).
Also, the empty Kirby Giga Bowser SFX entry doesn't indicate that Final Smashes were to be inhaleable.
It's more likely it indicates that Giga Bowser at one would've been considered a playable character of some sorts or at least inhaleable (as no such SFX entry for Warioman exists).
oh, i assumed that Nintendo stopped after making the sfx for gb. but yeah. i guess ur right. he could of been playable or something