Well, in a way they used him, he was a means to an end to them. Where they themselves come from, however, is still kind of a mystery
the glasses are not cursed. he wore glasses even before he met trebol and others.What if Doflamingo was used by Trebol/Diamante/Pica/Vergo ? They could have seen potential in him, and used him since childhood.
Maybe the glasses are cursed ?

Hey, that's not half bad! Thanks!Lazy edited and pupils with the same colors as Rosinante:
![]()
.