Xander is Karliah's younger brother. Only younger by a year or two, Xander still has a very firm grasp on what was wrong with his sister- a lot. He felt betrayed when Karliah took her own life, and yet... Couldn't mourn for her, not as much as he wanted to. Though he wished she hadn't offed herself, he was bitter- bitter for the way his sister had treated him in life. This shows in Requiem- he sings about how he's confused as to how what Evie's saying can be true- he knew Karliah as a monster, and Evie's saying she was a good person?

Later in the musical, after You Will Be Found, Evie and Xander hook up, and Xander convinces Evie that he loves her for who she is (Only Us) and tries to tell her that he doesn't want their relationship to be about the Karliah Project. He wants it to be about them.