Female “Majin Buu”-Like Character Found in the Dragon Ball FighterZ Trailer

A mysterious figure has appeared in the latest Dragon Ball FighterZ Trailer. She can only be seen in a brief segment of the trailer, but look closely on the right in the screenshot found in the article.

Can someone explain what the deal is with 21 is to me? Is 16 her son? Why does she have a majin form? Was she created be Gero? I'm very confused

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What's the likelihood of this happening? : r/dragonballfighterz

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