BBC has announced Casualty will feature its first transgender character in a continuing role on the hit show.Sah Brockner, played by Arin Smethurst, will join the long-running series with their first scenes airing later this month.Sah, who is transgender and non-binary, is the latest recruit to the paramedic team at Holby City Hospital.They will work alongside Jan, played by Di Botcher, Teddy, starring Milo Clarke, as well as Iain, who Michael Stevenson plays.BBC One bosses say Sah is a "cool character" who dislikes being publicly vulnerable and does their best not to be seen as trying hard.However, they will meet their match when working with boss Jan, who is keen to discover their big heart beneath the cold exterior.Smethurst, who goes by.