Verosha "Osha" Aniseya is a human Force user, twin to Mae, and by the end of the Disney+ series The Acolyte (2024) the acolyte of Qimir. She was played by Amandla Stenberg.
The one who left
Osha is taken off Brendok by the Jedi as a child and trained as a Padawan under Sol, and then leaves the Order without completing that training — she works as a meknek, a hull technician, when the series finds her. That failure is not treated as a moral flaw; the series is fairly pointed that the Order had nothing useful to offer her.
Two accounts of one night
The series is built so that Osha and Mae each carry an incompatible version of what happened on Brendok, and both are sincere. Watching Osha's account collapse — learning what Sol actually did, and what he has let her believe for sixteen years — is the engine of the last three episodes.
The turn
She ends the season with a red lightsaber, standing with the man who murdered her master's colleagues. Whether that reads as a fall or as the only honest option left to her is exactly the argument the series wants, and it was cancelled before answering it.
Canon status
Canon, created for the 2024 series.