Xi'an is a Twi'lek mercenary played by Natalia Tena in The Mandalorian, a member of the crew assembled by Ranzar Malk for the prison-ship job and the sister of the prisoner they are extracting.
She is written as a former romantic entanglement of Din Djarin's, which the episode uses for one specific purpose: she is the only character in the first season who speaks about Din's face as something she has seen. In a series built entirely on a helmet, that is a substantial piece of information delivered as a throwaway taunt.
Catalogue entry. This figure has a verified record here rather than a full write-up — the encyclopedia labels its own depth instead of padding it.