Syndey is the ony test subject that failed all of the tests apart from two. Syndey is 'the mistake' she cannot feel physical pain, and can just survive the disease: sptn009. A disease created by the scientists. She has a robotic arm because she has an obsessesion of hurting herself as she cannot feel it. She ended up damaging her arm so badly it had to get amputated..and replaced. she usually wears long sleeved shirts.