Siobhan grew up in a wealthy household, with loving parents, and a sister. She is in a relationship with Sergio Romeo. Ambitious, she has created the most popular club in Windenburg, the Paragons, and is its leader, therefore making her one of the most looked up to Sims in the city. However, being a Paragon means being in constant war with their rival group, the Renegades, which for her means constant war with her sister, who's part of the most infamous club in town. This makes her mother worried, as they no longer are getting along now.
She has established her popular network of friends in order to rise in her business career. She works as an Office Assistant and enjoys fashion, fun, and drinking at cafes.
Siobhan, like her mother, has an Irish name with a very particular pronunciation. "Siobhan" is pronounced as "shiv-awn.", possibly hinting that she may be of Irish origin.