Ultima

Ultima (ウルティマ), also known as Violet (原初の紫). She is one of the Primordials that joined Tempest after Diablo recruited them.

Appearance
Ultima is a cute and beautiful girl. She has purple hair with a ponytail on the side. She wears a black military uniform with a skirt, she also wears an armband on her left arm. She is shorter than both Carrera and Testarossa.

Personality
She acts cutesy but she is very cruel and sadistic. She is also very egocentric and gets mad easily.

Chronology
She was recruited by Diablo who was looking for subordinates to help out with chores. At first, Rimuru thought she wasn't strong but Raphael quickly corrected him. She energetically introduced herself and pledged loyalty to Rimuru. She was so cute that Rimuru doubted that she as a demon at first. After changing locations the unnamed Ultima gained a physical body by fusing together with an Emulated Soul and inhabiting one of the many bodies in the growth capsules prepared by Rimuru. He modified Ultima's skeleton and mixed gold into it, further improving the body. After she gained the body, Rimuru named her along with two of her 2 servants and 200 soldiers. The 2 servants were named Veyron and Zonda. Ultima and Veyron evolved into a Demon peer from being named while Zonda evolved into an Arch Demon.

A bit later, she was assigned to be Chief Prosecutor of the Public Prosecution Office in Tempest. She accepted the job happily and was looking forward to it.

Rimuru Tempest
She was doubtful of Rimuru and wanted to kill him but after he named her Ultima and gave her a body she became extremely loyal.

Carrera
In the Underworld, they were always competing and battling with each other. Now they are competing for Rimuru's attention.

Testarossa
In the Underworld, they were always competing and battling with each other. Now they are competing for Rimuru's attention.

Diablo
In the Underworld, they were always competing and battling with each other. Now they are competing for Rimuru's attention.

Trivia

 * She was named after the Ultima GTR supercar.
 * She was shown in The Ways of the Monster Nation spin-off manga in chapter 42.