Well, it works? Being born on the battlefield that particular way is a bit much for me personally, but that's just a flavouring thing. And isn't actually completely out of keeping with the AEG canon. Matsu Ketsui daimyo of the Matsu gave birth to a son while her husband was ganked by some Kakita, and despite the pregnancy taking a lot out of her, a week later she killed that Kakita.
I think you'd want Brash over Cursed by the Realm. Mechanically the Toshigoku curse is about getting more blood and targeting wounded people. Going from 0 to 60 because you got pissed is more how brash works. And it's worth extra points for Lion characters.
In terms of your stats, there's no good way to say this. Strength isn't that important. Because of how roll and keep works what matters most is the keep number. Strength only contributes to unkept dice. So take your basic katana at 3k2, add 5 strength gives 7k2 which isn't nothing. It does mean on average your going to have powerful hits when you hit. However, that strength 5 costs 20 xp, xp that you desperately need for other attributes. You want earth to be at least 3 so you don't die like wet tissue paper. (Probably want strength of the Earth too which reduces wound penalties) you want your agility up so you can hit people and make use of that strength. And you want uh, honestly just all the air. But reflexes in particular, the 4e game heavily favours initiative.
And you'll want void to help you not die.
