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Diane Johnson is one of the main characters of the hit tv show, Black-ish. She is portrayed by Marsai Martin.
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. 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.