Billy Cooper

William "Billy" Cooper (ウィリアム・「ビリー」・クーパー) was the cousin of Ashley Morris and a member of Team Stryker, as he was a close friend of the vigilante, Stryker. Billy moved to Ultimate City to start a life of his own after a falling out with his parents and became friends with Wes Gates.

Soon after, Billy was saved by the mysterious vigilante and became a member of Team Stryker, Wes revealed his identity and they agreed to keep Sue out of it. Over time, Billy helped Wes with villains such as Mickey Murphy, Tori Hayward, the Eagle, and Yuri Petrovsky.

Unfortunately, his involvement with Team Stryker made him a target for Heath Lenwood and was killed in an explosion by the deranged lunatic. Billy's death deeply affected Wes, as it made him break his no killing rule and sent him into retirement.