Byron Swain is a former student at the school Wisty and Whit Allgood used to attend. At the beginning of the Witch & Wizard series, Byron is an informer who tells the The New Order that the Allgoods are wizards, leading to the separation and arrest of Wisty, Whit, and their parents, Mr. Allgood and Mrs. Allgood. This causes the Allgoods, particularly Wisty, to hate him even more than they did previously. Later on in the first book, Wisty accidently turns Byron into a weasel by magic, and together with Byron's act of "tattling" on the Allgoods, prompting her to nickname Byron "The Tattling Weasel." Despite this, Byron is shown in the second book, The Gift, to have very strong feelings for Wisty. Later on in the second book, Byron believes that he and Wisty are the children in the prophecy due to a strange, magical connection they have, which he proclaims to be stronger than Wisty's magical connection with her brother, Whit. Byron eventually decides to show his dedication to the Allgood's case, such as brutally attacking The One's protege, Pearce, when he believes he is hurting Wisty. He also runs away with her to the shadow realm through an underwater portal but is wounded by Pearce when he confronted Byron and Wisty in the shadow realm. At the end of the book Byron secretly stows away in the back of the Allgood's van and overhears the intimate family moments which playfully irks Wisty into turning him into a weasel, but immediately turns him back because she feels sorry for him. Byron then explains that he only hid in the back to attempt to know more to get closer to Wisty, and then passionately kisses her and is described by Wisty as being "the most tender and electric" kiss she ever could have imagined coming from Byron. Then, when they are reunited once more with their rebel friends, Byron has his arm around Wisty's waist. In the last book, The Kiss , Byron tries to warn Wisty about the new guy and how he doesn't seem right.
He has an uptight apperance with brown eyes and brown hair.