(I don't own these pictures. All Rights go to the owners.)

Name: Brianna Tennyson

Gender: Female

Species: Half Human and Anodite

Age: Same age as Ben

Crush: Kevin Levin (Boyfriend)

Friends: Ben 10 Alien Force Allies and Ben 10 Ultimate Alien Allies

Enemies: Ben 10 Alien Force Enemies and Ben 10 Ultimate Alien Enemies

Family: Carl Tennyson and Sandra Tennyson (Parents), Ben Tennyson (Older Twin Brother), Gwen Tennyson, Ken Tennyson, Sunny, Joel Tennyson, Lucy Mann, Clyde Fife and Camille Mann (Cousins), Max Tennyson and Verdona (Grandparents), Frank Tennyson and Gordon Tennyson (Uncles), Natalie Tennyson and Betty Jean Tennyson (Aunts)

Others: Second Wielder of the Omnitrix and Ultimatrix.

Sounds like Mandy Moore in Ben 10 Alien Force and Ben 10 Ultimate Alien and looks like Emily Rudd in Ben 10 Alien Swarm