Aki Murasame

"A girl who is a Mecha-Ude user called the "Iron Twin-Arm Host" and belongs to the organization known as ARMS. She is after the mysterious worm-type Mecha-Ude user that killed her family. Because she has combined (derized) with two Mecha-Udes, she expends a lot of energy, so she's always hungry and can be seen eating something often." ― Aki's bio from official site