Ehhh? He's the product of thousands (maybe millions?) of years of magical eugenics. That's kinda the whole point of his character

If he's a Gary Stu it's the absolute worst one. Usually a Gary Stu has all the power and none of the suffering. I'd argue (in the books at least) that he has all the suffering and only some of the power (controlling the spice will give him the rest )

Is he related to Disco Stu?