Number Ten (Ella)

In The Power of Six, Ella became the new girl at an orphanage in Spain so that she can be with Marina aka Seven(Marina didn't know she was ten). Ella used her ability (NOT a legacy) to transform into a Seven year old (though she was really Eleven). Once the Mogadorians showed up, Ella revealed her to be a tenth member of the Garde nobody knew about. Ella and her Cepan Crayton took Marina to a lake nearby where they met Number Six.

In The Rise of Nine, they all went to India to find Eight, which they did. Eight showed them a cave with a Loric stone that could teleport him anywhere around the world. But the Mogadorians came and a battle started. In the battle, Ella's Cepan Crayton wsa killed. The rest of them teleported out. Ella ended up in the Gulf of Aiden but they didn't know where Six was. That's when Ella heard Six's voice in her head saying that she was dying in a desert in New Mexico. Eight told her it was probably her firt legacy forming. But it wouldn't always work because it's just developing. The three of them kept teleporting untill they ended up in New Mexico. When they were in Stonehedge, Marina heard Ella's voice in her head. Once they got to New Mexico, Ella used her telepacy to talk to Number Four. She told them to come to New Mexico to help rescue Six. Once Ella, Marina, and Eight met John (Number Four), Nine, and Bernie Kosar they went into the Government Base to rescue Six. They also managed to rescue John's human girlfriend Sarah Hart. Before they could find Six, they started to fight about a hundered Mogadorians. Number Nine was even fighting Setrakus Ra. A Mogadorian cannon just about killed Ella and Sarah, but Number Four brought them back to life. Eventually Number Six came and Setrakus Ra escaped. Then Ella, Nine, Eight, Marina, Six, John, and Bernie Kosar escaped together.