I love, love, love Marsai Martin who plays Diane Johnson. Diane is the smarter half of the twins (the two younger children of the four) and a quintessential Black Girl Nerd. I am completely ecstatic that such a character exists on TV right now. She wears glasses and prim outfits, and she uses big words. Her siblings never fully comprehend what she's saying, and Rainbow, her mom, has already accepted that out of all the kids, only Diane can follow in her footsteps and become a doctor.
Marsai herself is an eloquent, phenomenal young actress. Her comedic timing is flawless, her facial expressions are on point, and her voice is made of the purest charm.
I also like how Diane's perception vastly differs from her siblings. At the end of Episode 5 (the most talked about episode of the series thus far), her older siblings think Jack has gotten spanked and are terrified about being next. But Diane's biggest concern is that she owes her grandfather fifty bucks.
Like...this is so my girl!!!!