Y'ello.
For me, ryona began with Chun-Li, everyone's favourite fighting girl as well as Morin, a tonfa-wielding chick from an o-o-old game called Fighting Masters.
There's something empowering and appealing about Chun-Li, from her cry of defeat when she goes down to the way her unconscious body hits the floor with a muffled thump, showing how, despite her speed and power, she was still so delicate and soft.
Let's be frank though; sex sells and most fighting games make defeat an orgasmic experience for female fighters. This is less prevalent in recent soul-caliburs with some really spine-rattling death screams, but they are being cut and stabbed so I suppose those blood-curdling cries are warranted.
My favourites would probably still be Yuri Sakazaki and Mai Shiranui from king of Fighters '94. The way Yuri cries out, there's something hopeless and helpless in her voice when she goes down and of course the fact that her top gets blasted off also makes it arousing, the last of her strength used on her modesty as she tries to cover her now-exposed bra.
As for Mai it's something similar and the way she slumps onto her side, face looking down in shame.
...
Yeah, this sounds really mysoginistic, doesn't it?