Gwen Tennyson

Gwendolyn "Gwen" Tennyson is a central character in the Ben 10 franchise. Ben's paternal cousin, Gwen, is often the brains behind Ben's brawn, assisting him in fights. In the Classic Continuity's Prime Timeline, Gwen discovers latent powers for manipulating mana and learns magic. She can transform into an Anodite, a being of pure mana energy, which grants her extraordinary powers.