Miscellaneous ideas.
Chun Li's dad died when she was still a kid, IIRC, so she's out. Cammy has no parent figure besides Bison (who kidnapped her, by the way, when she was a child - all Shadow Dolls were kidnapped, brainwashed if needed and then trained to be assassins).
Mai Shiranui is already engaged to Andy, and KoF canon hints they were engaged at birth, so she's out as well.
And Morrigan is the daughter of a demon, so she'd have no interest in a mortal, no matter how strong.
Now, other choices quite possibly include the majority of the KoF cast, as well as Makoto and Ibuki from SFIII. Makoto in particular is IDENTICAL to Akane, except she's one hell of a fighter, having actually DEFEATED Ken.
Other choices... Angel, though she's a complete mystery, not to mention she seems to like K9999... Kasumi Todoh, the Kyokugenryuu's sworn rival... I'd like to say Rose Bernstein, but she's 18 as of KoF2k3, so she'd have been 11 by the Ranma timeline...
Oh, and if you want seriously fucked up, have Goenitz arrange, for whatever unfathomable Orochi plan he may have, an engagement between Ranma and Shermie. That'd be weird as hell.