Seylan's acting career began in 2014, when she responded to a Facebook post and landed the role of the Older Witch in the film Macbeth, directed by J. Kurzel and produced by StudioCanal. This marked the start of a prolific acting career, with numerous productions following, including her most recent roles as Tecteun in Doctor Who, a BBC series, and as the medium in an online séance in the ground-breaking zoom horror film Host, directed by R. Savage and released on Shudder.
Born near Glasgow, Scotland, Seylan holds a degree in languages, specifically French, Spanish, and Portuguese, from Salford University. Additionally, she earned a degree in Scottish Music, with a focus on cello and voice, from the prestigious Royal Conservatoire of Scotland.