I don't have any females... yet. But even between my three males I have noticed distinct personality traits. My plakat male, Hiei, is ferocious. He bites at my fingers when I feed him and flares if I so much as dare to TOUCH the side of his tank.
Nova, on the other hand, is super chill and actually a bit of a scaredy cat. If given the option to flare at his reflection or swim to the other side of the tank, he'll generally swim away. He only flares when he's good and ready.
And then there's Kai... who thinks he's constantly on display. He flares at EVERYTHING, and by everything I mean nothing at all. He's so silly... always showing off like "Mom, look at MEEEEEEE! And gimme a bloodworm while you're at it!"