Last seen at the end of Solo: A Star Wars Story, the character of Qi’ra may be an unorthodox inclusion, but one that does make a fair bit of sense in the right context.
Originally the love interest of Han Solo, Qi’ra was revealed to be a member of the Crimson Dawn crime syndicate. And after the death of Dryden Vos, the crime lord Qi’ra worked for, she left to rendezvous with Darth Maul, the head of the syndicate.
Played by Emilia Clarke, the character of Qi’ra has not appeared in Star Wars since. And with no news of any sequels to Solo, whether or not she would appear again is up in the air.
However, if Boba Fett is going to be running his own crime empire on Tatooine, it would make a fair bit of sense for him to have dealings with other syndicates like Crimson Dawn. And with Maul deceased at this point in the Star Wars timeline, someone will have needed to take his place. Enter Qi’ra.
As she said in Solo regarding her life in the syndicate, “the object isn’t to win. It’s just to stay in it as long as you can.” With that logic, it isn’t unreasonable to assume that she never had an intention of leaving, and instead looked to rise to the top of it.
Beyond that, while her fate following the events of Solo remains unknown to this point, it’s entirely possible she is still alive and working with the syndicate, and if you digitally age up Emilia Clarke for it, she could very easily reprise the role for this time period.
Bringing back the familiar character such as Qi’ra to be a face of a rival Syndicate would be an interesting move in order to help flesh out the series and create more links to other Star Wars properties.
Beyond that, Emilia Clarke does have a certain amount of star power associated with her name, largely from her days as a member of the Game of Thrones cast, and bringing her into the series in some capacity would only help it.