Nubia is an honorable Amazonian warrior that took up the mantle of Wonder Woman following Diana's absence.
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History
When the mythical Olympian world collapsed and Grail usurped the throne of Queen Hippolyta, Nubia pretended to betray the Queen and support Darkseid's daughter until the Amazons could once again rally and fight for Themyscira's recover.
With Diana's departure at the end of the great battle that redefined the Multiverse, some Amazons fought each other for the title of Wonder Woman. Queen Hippolyta wisely imposed a test of courage, saying that the next Wonder Woman would be the one who dared to look at the head of the Gorgon Medusa inside a bin, and only the one whose heart is just and whose mind is not clouded by ambition would survive the petrifying gaze of the monster.
Only Nubia, without hesitation, agreed to undergo the test, but inside the bin instead of Medusa's head she found a golden crown. Hippolyta made her the new Queen of the Amazons while she herself would go to the World of Men instead of any other. The other Amazons were pleased by Hippolyta's choice, who also passed the royal scepter to the new queen.