This is Female goku black and Female goku. Goku black is a beuatiful,arrogant,cocky godess who loved to domiate. She is very agressive and mean to non mortals. She is like a big sister or mother to goku. They want you to call them mommy for some reason. 
Goku is a shy but agressive and dominate too. She is usually behind goku black most of the time but she is agressive and dominate to alot of the time. 
When goku black is speaking iwill say Goku black: 
When its goku its Goku:
They speak 50/50 