I have a problem her. She starts off as Arcee's rival when she first comes to Earth, and it's like ok that's her role... but no, then she becomes female Starscream. Wait, Starscream isn't female? Then she's like frozen forever and a month..... Oh look she's out! She played a role in the plot! Now, she's a vampire.... I don't know, it's like they randomly insert in episode to fill in plot holes or something. She doesn't seem to have a real defined role. Maybe she's all fan service? Which is fine, but she seems so random.