many people compare Misty and Opaline’s relationship with that of Rapunzel and Gothel.
but this comparison is wrong, the only thing that Gothel and opaline have in common is that they are both vain and obsessed with magic.
but the basis of their relationship with Misty and Raponzel are completely different, Opaline treated her like a servant, constantly belittled her and had a very clear disdain for Misty, Gothel despite everything treated Raponzel well, wanted her to be as isolated as possible and makes her believe who was her mother and genuinely loved her and after Raponzel discovered the conspiracy behind.
The real Disney relationship that is comparable between Misty and Opaline is the Frollo and Quasimodo relationship.
Both welcomed their disciples from a young age in a vulnerable situation despite their type, even though they raised them they treated them as who should be grateful to them, without being open in saying that they see them as incompetent, manipulating them by saying that no one would care about them for being freaks, it was only when Misty/Quasimodo discovered true kindness and friendship that they realized the evil of their masters and opposed them.
plus opaline and frollo have a fire theme.