Sosanya has appeared in many roles in the theatre, on television and in films. Her first big break in theatre was in
Anthony and Cleopatra at the National Theatre, and in television with the 2001 series
Teachers when she appeared as English teacher Jenny Paige. She also appeared in
Sorted,
People Like Us,
Love Actually,
Nathan Barley,
Renaissance,
Casanova, as Karen Blaine in the
Jonathan Creek episode "The Three Gamblers",
Much Ado About Nothing,
Cape Wrath/Meadowlands, the
Doctor Who episode "
Fear Her", and
FM. Sosanya appeared as Colly Trent in series 2 of the
BBC television drama
Five Days. She appeared in the
BBC Four television series
Twenty Twelve, a comedy about the London 2012 Olympic build up, and the
BBC One drama series
Silk and
Hustle. She also made a brief appearance in the children's
CBBC science fiction series,
Wizards vs Aliens as Benny Sherwood's mother, Trisha. She appeared as Sister Mary Loquacious in the first series of
Good Omens in 2018. It was announced in January 2022 that she would be reappearing in the second series. In season 2, she appeared as Nina. Neil Gaiman, the writer and showrunner, confirmed that the character was named Nina as he had always planned for her to be played by Sosanya. In 2019, Sosanya narrated the CBeebies bedtime TV series,
Moon and Me which is set in a toy house and follows the lives of toylike characters: Moon Baby, Pepi Nana, Sleepy Dibillo, Lambkin, Little Nana, Mr. Onion and Collywobble. There are 50 episodes. In 2021, it was announced that she had been cast as lead warden Leigh in Channel 4 drama,
Screw. It was broadcast in January 2022.
Theatre In 2003, she played Rosalind in
As You Like It with the
Royal Shakespeare Company (RSC) at the
Swan Theatre, Stratford-upon-Avon. In 2008, she returned to the RSC to play Rosaline in ''
Love's Labour's Lost and, in 2009, appeared in a radio adaptation of a story from the short story collection The State of the Art. In 2016, she appeared in the world premiere production of Elegy'' at the
Donmar Warehouse.
Audiobooks Sosanya reads the part of Sephy on the audio book versions of
Malorie Blackman's
Noughts and Crosses series. She plays the lead in the audio adaptation of the 2000ad sci-fi comic series Brink. ==Personal life==