I don't know any other al ghul ships! Damn you! Hmm, what about that short-lived Ra's/Black Canary pairing?
Ah, yes. When Ra’s took the name Raymond, dressed up like Aristotle Onassis, and whisked Dinah away on his loveboat. (And no, for anyone who hasn’t read it, that’s not headcanon - that actually happened. The story also featured an adorable Talia rolling around on a bed like a cat and talking to Dinah about Dinah becoming her stepmother.)
For some headcanon, I don’t like the idea of Ra’s being so creepy as to have an uninformed affair with someone, so in my version of events, Dinah secretly suspected Raymond was Ra’s al Ghul. After all, everything about him seemed to point toward it—his vase resources, his loyal servant and other devotees, his strange intimate knowledge of past and global events, his secrecy, and finally, his daughter. Furthermore, her anger at Oracle and some of the others in the superhero community has left her a little embittered about them as a whole. After that falling out combined with the Ollie fiasco, she didn’t want to admit to herself that she might have actually fallen for a criminal, especially not one of Ra’s’ caliber, so she went along with the ruse, finding that Ra’s actually treated her a lot better than Ollie did (let’s face it, folks, Ollie can be kind of a jerk).
She knew the affair couldn’t last, but she wanted happiness while she could get it, and Ra’s certainly provided the escape from the world she was looking for. Living on the yacht with Ra’s, Talia, and their servants, Dinah came to realize two things: A) Ra’s was actually a skilled and thoughtful lover, and B) Talia is quite a manipulative woman with her father and devotees. Knowing that Talia is also working for LexCorp at this time (that’s canon), Dinah uses her free time on the yacht not only for personal reflection but for investigating Talia’s reasons for being there. She can’t, after all, rid herself of her heroic instincts, and she suspects that Talia is using her father in order to gain access to information or resources for Lex.
However, both the affair and Dinah’s self-appointed mission are cut short when Ra’s reveals his dark side over their conversation about children (in the actual comic, he does come off as rather misogynistic there). Insulted, Dinah knows she can’t go on with this any longer and plots to leave, only to be interrupted when Ra’s and Talia forcibly take her to the Lazarus pit to “heal” her of her infertility (which really did happen in the actual canon).
Though Dinah now regrets the affair and won’t speak of it to anyone, she believes she has a unique insight into Ra’s and his methods of persuasion, for of all the heroes, she alone has personally experienced how charming he can actually be.
And she still thinks he’s hot.
She probably also regrets not stealing one of Talia’s dresses.