Alphas
The Alphas are a group of college werewolves that act as Harry's apprentices and backup in the series. As classic werewolves they were taught a wolf transformation spell by a wolfwere (a wolf that can become human, Tera), as well as how to behave in their transformed state. They are initially slightly nerdy students led by the werewolf Billy. While physically weaker than many of their adversaries they make up for this with the use of teamwork and guerrilla tactics, such as ambushes and hit and run operations.
In the beginning of the series, the Alphas fought and travelled in large numbers. However, due to graduations of the students and other life happenings, most have moved on. By the time of "Harry's day off" the Alphas are down to four members and lose one more in the events of Turn Coat. However, they are increasingly competent at their tasks, gaining enough of Harry's respect to become among the truly 'clued in'. Will has demonstrated that they can use their shapechanging ability to quickly heal wounds, although it causes great hunger to do so.
The current members of the Alphas are Will (the leader), Georgia (Will's wife), Andi (the cute redhead) and Marci (returned in Side Jobs).
Read more about this topic: List Of The Dresden Files Groups