Elsa

Elsa is a servant of Mesogog and believes in his dream to see the world reverted to a primordial state under the control of the dinosaurs.

Elsa is loyal and will do anything to please her master. She loves to insult and torment her enemies, including Zeltrax, and seemed to be romantically interested in Tommy.

Elsa is capable of projecting powerful streams of energy from her sword and possesses incredible martial arts techniques.

For much of the early part of the series, she pretended to be Principal Randall, the head of the high school in Reefside, California where the Dino Thunder Power Rangers go to school (or, in the case of Tommy Oliver, work). She believes making the high school experience as miserable as possible. Principal Randall is a little suspicious of why Dr. Oliver is working as a science teacher at Reefside. She enjoys prowling the grounds and looking for students to send to detention. Meanwhile, she tries to use her secret identity to complete her true mission for Mesogog.

She gave the Rangers a hard time on their first day of classes.

She tried to get close to Dr. Oliver, in order to find a way to defeat him for Mesogog. She tried to trick the Rangers with a false Dino Egg and unleashed the StegaZord on the city. The Rangers were able to reprogram the Zord to their side.

Elsa gave herself a new look with longer hair.

When Zeltrax left Mesogog's forces, Elsa became his main general. She continued to come up with evil plans to take down the Rangers. Mesogog began to grow weary of her constant failures.

When Elsa had taken a card of a powerful monster from Ethan James (Blue Ranger), she was exposed as the evil servant to Tommy, and to the entire school while fighting him outside of school.

Mesogog then decided to sacrifice the evil powers which he had granted to Elsa in order to help power his trans-mutation cannon. With that, she was reverted to a normal human form, with no memory of who she was as Elsa by the life-force extractor. The loss of her powers also meant she was good again, and there are hints of a romance between her and Anton Mercer, though it is unknown whether this will amount to anything.