Bedoop
Poyon
Well let's look at it realisticallyI am sure there is, having Alex Kidd in smash doesn't mean "random and useless"
Metal Mario has appeared in 2 Mario Karts (Where he's one of the most picked, especially in 7), An Arcade Game, 2 Sports Games, Dr. Mario 64, and every single Smash game to date (Albeit, he was only truely unique in 64 and Melee before everyone else joined in), has his own theme, stage, SFX (His Metal Stomping), unique speech pattern compared to Mario, properties, and would be really easy to make, just remove Mario's Metal Box Texture's pupils and bam, new character.
Meanwhile Alex Kidd only appeared about a handful of times, and like many others have said...
He's both metaphorically, and literally, dead.
R.I.P.