Aside from the common choices; when Fiona and Rhys approach the Vault, there's a romantic option the player can take. Before they enter the Vault, Rhys can either place his trust in Fiona and admit he has feelings for Sasha or chose that he has feelings for someone else; which is heavily implied to be Fiona based on his body language and facial expression when revealing to her that he is "interested in someone else."
"Well, who knows... maybe this is just the beginning." Throughout the story, Jack likes to call Rhys by whatever comes to his mind such as 'Rhysie' and 'cupcake' but also degrades him by calling him a 'pitiful little code monkey', believing that Rhys can't follow in his footsteps.After telling their tales, Rhys and Fiona patch things up and become friends again. Throughout the story, there are many moments that could create a romantic relationship between Rhys and Sasha, should the player decide to do so.
It's revealed that Jack once spat on Rhys when he was alive. —Rhys to Fiona before opening a Vault (Determinant). She hasn’t yet been confirmed for Borderlands 3, and hasn’t appeared in any of the game’s … At the beginning of Episode 1, Rhys is shown to be a big fan of Handsome Jack and, like other fans, wanted to become like him. Later on, Rhys disagreed with Jack about becoming a living vessel with him therefore things went downhill on their relationship.It's rather unclear as to what Handsome Jack and Rhys' relationship is but their similarities are constantly lampshaded by Jack throughout the story. They also share a hug when reunited in Episode 5, if Rhys chose to reject Hyperion. The ending of Tales from the Borderlands saw both Fiona and other main character Rhys enter one of the mysterious Vaults, disappearing as they do so, and players had no idea what happened next.
As far as we’re aware, Fiona is still alive, although her whereabouts are unknown. https://steamcommunity.com/sharedfiles/filedetails/?id=555179370
Rhys is an ambitious man, and dreams of becoming the next Handsome Jack, trying his best to fill in his shoes. He can either admit to liking Sasha and get Fiona's 'blessing' or say he likes someone else, implying that he likes Fiona. He mentions a moment they shared during junior year, which means that they have known each other for roughly nine to ten years or so by the time the game takes place, due to Vaughn's and Rhys' and the age juniors are.Rhys is an ambitious man who likes to be the center of attention, but he has an understanding mind about his Hyperion position to Pandorans, who would most likely see him as a supporter to Handsome Jack's destruction of their planet. He gets along with two co-workers, Vaughn and Yvette, but maintains a rivalry with Vasquez.Rhys' most notable features are his ECHO eye implant, which allows him to scan objects and reveal information about them, all of which are from the Hyperion database; and his mechanical right arm, which has a built-in interface.
https://www.gamerevolution.com/guides/522127-borderlands-3-fiona The player can also choose not to like either.