I kind of admit regarding Tim Drake as something like Marquis de Sade or rather having to model him after Marquis de Sade as I feel he’s kind of corny (and so is Stephanie Brown to some degree). As for Marquis de Sade, there has to be a reason why he’s called the Divine Marquis. He’s really a debauched criminal who not only harrassed women but also killed youngsters.
(Him kidnapping and killing children in his care whilst his wife tolerating it until later in life makes me wonder whether if 120 Days of Sodom is partly based on it by the way of exaggeration*.)
Him being brought up in a bad household, beating up his cousin and military experience at a young age would’ve shaped him for the worst. Yet for some people like Guillame Apollonaire, Sade’s got that neat macho air to his antics. His wife Renee was generally complacent until the very end.
Even if he toned down his atheism after befriending a short priest, he still molested youngsters like Madeleine and a boy. Definitely not somebody to be messed within his vicinity but an interesting enough character to not only have his works adapted in the mid to late 20th century (Playboy and sexual revolution) but be a muse to films like Quills and Marquis.
He even had his own comic books, ahead of Tim Drake. If Tim Drake is Marquis de Sade (wealthy and highly trained), then Stephanie Brown is Renee Pelagie (relatively not bright and recent but complacent). There’s even a precedent for Tim Drake giving into evil, perhaps helped by the DCAU.
Him being the Marquis de Sade takes this to a logical conclusion but would also make him much worse than Jason Todd on a bad day. Jason Todd being irritable and violent’s one thing. Tim willingly killing people and then passing it off as a joke’s another.
Him being host to the Joker in DCAU hints at it as well as being host to OMAC. Perhaps with Tim Drake being intended to likable, you feel tempted to be wary of him. Marquis de Sade isn’t any less dubious but is increasingly regarded as a misunderstood muse and storyteller hence the epithet Divine Marquis.
*Duc de Blangis has a bishop for a brother and Donatien Alphonse Francois’s own father was a debauched aristocrat with an abbot for a brother (and DAF’s in-law was a judge) so there’s that.