I don't know about cockerels but my girls have very distinct personalities. I can't tell several of them apart anymore until I interact with them. Then I see the differences.
Lucy is very jealous, she pecks at anyone I pet or hold. Ivy is the loner of the bunch. And Gertie is a nut job! She can't go into the coop on the first try. She always ends up circling it two or three times before she makes it in.
I have a pair of lavender Pekins. The rooster is has a brilliant personality and is a real softie, I love him to bits...His hen however, is generally quiet and isn't interested in human interaction.
Unfortunately my rooster is getting very old I know he won't last forever so I'm trying to decide if I'd like another rooster or a couple of hens to make a trio with my existing hen.
(PS: what breed are your girls? They have very big, red combs for ladies! They're beutiful)