Jemma Billing was born in England to Vulcan and Carolina Billing. She was bullied most of her young life and learned to control her emotions so as not to show the bullies her fear.
She loved her mother, and her life, and was blissfully happy, until Carolina met Jason Campbell, at a bar. They fell in love almost instantly, and lived together, then eventually got married.
Whilst Carol was around, Jason was sweet-as-sugar to Jem, but when she wasn't, he made Jemma do numerous chores and other tasks. She hated this, but was threatened by Jason that if she told Carol, he would kill her. So, she lived like this until she was eleven.
It was just a normal day at school for her, and while she was playing, a gryphon caught her demigod scent and attacked her. She screamed, and ran for her life. Just as it swooped in for the kill, a large she-wolf brought it too the ground and killed it. She explained to Jemma that she was Lupa, and then about demigods. They went to the Wolf House, where Jem trained for two years.
She then travelled to Camp, where she was claimed, and joined the First Cohort. After five years, during a battle, one of the praetors was killed. Being a centurion, Jemma was nominated for new praetor. She was elected, and now runs Camp alongside the other praetor.
Jemma has shoulder-length, red hair and green eyes. She is 5'9" tall, and is quite slim. She has large muscles, and is immensely strong. On her arm she has 'SPQR' tattooed, along with the symbol of her father, Vulcan, and five score lines. She speaks with a British accent and is left-handed. Jem wears plain, tight tops, and skinny jeans, so that when she is working in to forges, they don't catch alight. She loves Converses and has a large collection.