The group of three

This group of three
Is unlike anyone I've ever seen
Erin, her blonde hair shining
Against the heat of day
Personality bright
that changes with the night
Bernice, her black hair gleaming
Against the moon's fading light
Cheerful with a dark side
shifting with the tide
Rachel, her brown hair shimmering
Nice, quiet, compassionate
can be mean with a passion
This group of three
is unlike anything I've ever seen