The males had more personality, overall.
1. Miria had the same personality as Isaac. Isaac seemed smarter most of the time but Miria occasionally blurted out something intelligent, as if she was acting dumb just because she's in love with Isaac.
2. Ennis had no personality, she started off as a Homunculus after all. All we've got of her is she's fundamentally good willed and loves her friends.
3. Chane hates being enslaved by her father and killing people, but being a mute gives us no view into her personality either.
4. Lua had barely any screentime, we know nothing of her aside from her being in love with Ladd.
So I don't disagree with you.