We already kind of have the Frollo/Esmerelda dynamic with DAO Cullen and the Female Mage Warden. The only real "forbidden" romance in the Chantry seems to be between Templars and Circle mages, and we've already seen our devout holy man (DAO Cullen) trying to repress his (possibly unrequited) taboo lust for a young woman (female Amell or Surana), and being driven partly mad by it (as the demons used his crush on the female mage Warden to try to break him).
Other than that, I don't really see the Hunchback of Notre Dame working because I don't remember seeing any huge Chantry cathedrals in any of the games, so where would they hide a hunchback? A Circle tower? Maybe, but then the Frollo would be a Templar and the Esmerelda would be a mage.
The closest thing to gypsies in Thedas are the Dalish, so I guess I could see a story about a Templar who falls into lust with a Dalish maiden whose clan comes close by (maybe to trade), but is thwarted by the "hunchback" (either a hideous dwarf or a lone Qunari far from home, who's kept in a separate room in the tower) helping her.
- If this is the Disney version, then it's about a Knight Captain who attends a festival, where the "hunchback" wanders in and gets tormented by the crowd. The Dalish maiden helps him, then in the process she's revealed or accused of being a mage. Then she's taken to the Circle, where the Frollo Templar tries to imprison her so he can force himself on her, but she befriends the "hunchback," who helps her escape. Then she's hunted as an apostate, where the Knight Captain leads an increasingly brutal search because he's been driven mad by his repressed lust, and tries to lead a genocide against the Dalish just as Frollo tried to lead a genocide against the gypsies in the movie.
The Archdeacon is a Revered Mother who tries (and fails) to act as his conscience, and the Phoebes is a lesser Templar who serves under him until he quits to stop his tyranny (kind of like how DA2 Cullen turned on Meredith when he FINALLY saw how far she'd gone).
- If it's the original Victor Hugo novel version... it's much darker, and I don't want to go into it.