Doctor Who slash fanfiction often features unconventional pairings and delves into emotional and intimate moments. It might play with alternate universes or timelines to justify the relationships. Also, the writing styles can vary greatly, from sweet and fluffy to angsty and intense.
The main characteristic of Doctor Who slash fanfiction is the focus on non-traditional romantic pairings. These stories can have complex plots and character developments, and they sometimes challenge the established canon of the show to create unique storylines for the paired characters.