Diane Johnson
NameDiane Marie Rosie Johnson
FamilyAndre Johnson (father)
Rainbow Johnson (mother)
Zoey Johnson (sister)
Andre Johnson, Jr. (brother)
Jack Johnson (twin brother)
Devonte Johnson (brother)
Earl Johnson (paternal grandfather)
Ruby Johnson (paternal grandmother)
Rhonda Johnson (paternal aunt)
Sharon Johnson (paternal aunt by marriage via Rhonda)
Alicia Johnson (maternal grandmother)
Paul Johnson (maternal grandfather)
Johan Johnson (maternal uncle)
Santamonica Johnson (maternal aunt)
Almaviligerais Johnson (paternal great-aunt)
Mabel Johnson (paternal great-grandmother)
Cha-Cha Johnson (paternal cousin)
Dante Johnson (paternal cousin)
Carl Johnson (paternal cousin)
Diamond Johnson (paternal cousin)
Riley Johnson (maternal cousin)
Hunter Johnson (maternal cousin)
BornOctober 21, 2006 (2006-10-21) (age 12)
Portrayed byMarsai Martin

Diane Marie Rosie Johnson is one of the main characters of the hit tv show, Black-ish.

She is portrayed by Marsai Martin.

Character Info

She considers herself to be smarter & more mature than her twin brother Jack.

Diane and Jack are the Johnson family's eight-year-old twins at first, now twelve years old. Diane is gifted and talented. She thinks she has all the answers but has yet to develop a filter to put them through. Although she is one minute older than Jack, she likes to think she is smarter than her twin brother by ten thousand minutes.

Throughout the series, Diane morphed from a sassy, intelligent, normal little girl to a scheming, calculating, dangerous, eccentric, scary, and intimidating adolescent. On numerous occasions, Diane has scared her family, relatives, and peers because of her bizarre personality. She finds delight in bullying her brothers, being right, gory and bloody scenes, weapons, nunchucks, spying on others, insults, and chaos in a household. She believes friendship and sickness is a sign of weakness and is recognized in her family for being scary and threatening arson. There is unknown history between her and Charlie Telphy, though the latter is terrified of Diane and tries to warn Dre of her capabilities. She is also a conspiracy theorist in the most ridiculous of situations and is able to twist any situation for her own advantage. In the time when Diane began her menstrual cycle, she adopted a more nasty, dangerous version of herself where she promised to hurt Jack in his sleep and burn down the house. Her very essence in a room is enough to make anybody in the Johnson family jump; Bow, Dre, Ruby, Junior, Zoey, respectively.


  • Diane had court-mandated therapy when she was 10.
  • She claims to hate everything.
  • She claims that Jack holds her back.
  • According to a career test, she will be in a high position of power in a political organization.
  • Diane is in a fight club.
  • Of her and Jack, Diane was the first to read, the first to ride a bike, and the first to pee standing up.
  • She hates chips.
  • Diane hates s‘mores.
  • She and her brother have watched the movie “The Shining”.
  • Because of her obsession with fire, Diane is hinted to be a pyromaniac.
  • Diane does not know how to cry.
  • It has been said multiple times that Diane does not say ”I’m sorry.”
  • Diane’s favorite dessert is Chunky Monkey ice cream.