Well, there isn't "the" audience. So I just talk about what I think. I think Jade is a good female protagonist. FMA has strong female characters yes, but you shouldn't take that every work by a woman has this automatically. A lot of shoujo is ridicilous in that regard.You make a good point. Unfortunately I can't do proper analysis of what traits audiences who want a strong female lead want. My biggest experiences are with stuff like Alien and the Wool novel series. Maybe Beyond Good and Evil. Do they want a character that can stand on her own? Would FMA count since it's done by a female mangaka and indeed has (at least to me) strong female protagonists such as Hawkeye and Armstrong sister?
The core, the most important thing for a strong female character is, that she is her own person. That she would have a life, hobbys, likes and dislikes even without a male character or something. A person that makes decisions, that has the strengh to think for herself, not a tool for the plot or a dick.
Satsuki is certainly strong. She made her own little kingdom and loyal followers. She can stand without problems on her own legs.Hmmm, what of Ryuko and Satsuki from Kill la Kill? How would they be quantified?
But Ryuuko? I never thought that she was a very good protagonist. She is constantly being pushed and ordered around by others.
I suppose this is a half-joke post, but she is actually a very strong female protagonist.sabagebu has the strongest female lead in recent anime history