Brother Blood, when Trigon isn't the main nemesis, is definitely the one that makes the most sense to pit her up against. You can kind of divvy up the whole New Teen Titans that way, where excellent undercover vigilante dude (and proto-spy) Nightwing faces off the best against Deathstroke, HIVE and the Vigilantes; Beast Boy has lots of Doom Patrol and Mento drama and then the addition of Terra which kind of jumps him over to Outsiders drama, too. Starfire has a whole planet. Donna has a whole shifting pantheon of gods. So on and so forth. There's good crossover of course ... these things mix and match up nicely.
Raven is kind of tough in the way some might find Superman tough with the "full power set" conundrum of how do you go bigger than that? But I think an obvious Chilling Adventures of Sabrina type route seems pretty easy to picture.