19 (Almost 20)
Kieren Walker (Brother)
Human Volunteer Force (formerly) Roarton Protection Service (currently)
She is 4 years younger than Kieren. During the rising she is part of the HVF and kills many of the undead, but being faced with her brother in his 'untreated state' brings her to her limits and she doesn't shoot him- or Amy- and thus they get treated.
She is said to be seen as a 'rough tough bad-ass' but says she isn't because she couldn't kill Kieren even if her life depended on it.
Initially, Jem is quite hostile towards her brother, Kieren, as being a part of the HVF and him being a PDS sufferer puts a strain on their relationship.
Dominic Mitchell confirmed Jem's sexuality to be bisexual on his Twitter. [source]
It was confirmed by Mitchell that, had a third season been made, Jem would have had a girlfriend. (This would then help lessen the blow of the 'bury your gays' trope used with the death of her previous girlfriend, Lisa)
Jemima's role in the HVF continues even after Kieren's return to Roarton. She continues wearing full tactical gear and carrying her gun; she also takes part in anti-PDS behaviors, like patrol and HVF engagements. Her anti-PDS stance is one she stands by as she yells at Kieren and calls him an impostor. He proves to her he is not an impostor through a story only he would know. Still angry and upset by her brother's unprecedented suicide, and struggling with memories of him as an untreated PDS sufferer, she struggles to accept him in the undead state he is now in. Still, she recognizes that Kieren is her brother and warns him will Bill Macy comes to kill a PDS sufferer on their street because she believes his life is in danger. She also informs him of Rick Macy's return. In the finale of Series 1, Jem accompanies her brother to Lisa's house to inform her parents of her demise. She defends her brother through out series 1, despite her misgivings, and eventually accepts him for who he is.
Jem returns to school and decides to re-sit her GCSE's. Her relationship with Kieren is much stronger and they have grown considerably close. However, she omits from telling him the isolation and taunts she receives at school (because her brother is a PDS-sufferer) as she doesn't wish to upset him or make him worry.
Jem is a close friend to Gary as the two bonded when working together in the HVF during the Rising, later the two are brought even closer after the death of Henry Lonsdale which reveals their romantic feelings for each other. Although as Gary had forcefully given Kieren Blue Oblivion, the two break up afterwards.