Kikka Kastlen

"I'm Kikka Kastlen. I'm a nurse who works for this institute. I was told by Irina to take care of your everyday necessities. It’s a pleasure to meet you ❤"

- Kikka introducing herself to Hayato

Kikka Kastlen is a notre domain from New Notre Dame, she works as a Researcher alongside Irina Florence in the Centrel District.

Appearance
"Moreover, her age is great, her hairstyle is great, her appearance is great, she's similar to Kashiwagi Miharu who is the nurse in charge of his little sister Karen."

- Hayato describing Kikka

She is a beautiful young woman who has light purple hair and light blue eyes who has a voluptuous figure, the most notable being her enormous breast. Kikka was seen to be dressed in the nurses' outfit of New Notre Dame, which is similar to the ones on Earth.

Personality
"You know, to leave a proof that you came to this planet, to leave something behind here in me. What I'm saying is that It’s fine to use me as a vent of a man’s desires ❤"

- Kikka flirting with Hayato

Kikka is first shown to be quite generous has proven after her first interaction with Hayato, while being interested in him due to being an alien (from the Notre Damian's perspective), as a result, of being a researcher herself. She is also vulgar and flirtatious as she attempted to become Hayato's local wife, while also attempting to get his "DNA" through using a normal sexual encounter and even her mouth.

Trivia

 * Her first name is German for "Mistress of all", which is a reference to her wanting to become the local wife of Hayato Kisaragi.
 * Kikka is the parrel of Miharu Kashiwagi.
 * For instance, both have similar voluptuous figures and worked as nurses albeit RIkkia played a nurse to get close to Hayato.