Riley Costello is a fictional character from the British Channel 4 soap opera Hollyoaks, played by Rob Norbury. Riley was introduced on 20 July 2010 with the Costello family as part of a cast overhaul of the series. In December 2011, the serial's executive producer Emma Smithwick said that Riley would remain in Hollyoaks despite his family's departure. On 14 September 2012, it was announced Riley was to leave Hollyoaks and Riley was killed off in a shooting during the episode airing 3 October 2012.

Jem Costello is a fictional character from the British Channel 4 soap opera Hollyoaks, played by Helen Russell-Clark. She made her first on-screen appearance on 5 March 2010. It was later announced that Jem had been written out of the serial, and the character would leave in November 2010. Russell-Clark made her final appearance as Jem on 30 November 2010.