Run Elsie Jewelria

Run Elsie Jewelria is a childhood friend of Lala and the girl version of Ren Elise Jewelria. As Run and Ren are royalty from planet Memorze, they can change gender in mind and body upon triggering a specific stimulus. In their case, a sneeze. Through an accident, Rito kissed Ren. This kiss caused Run to fall in love with Rito, while it caused Ren to further dislike Rito. Run becomes a famous idol who has released several albums. She becomes friends with Kyouko after Run played an antagonist in her show and now are often seen together, even releasing a few albums together. In Chapter 9 of To Love-Ru Darkness, Run and Ren permanently separated into two separate beings after reaching 'adulthood'.

Appearance
Run has light green hair, is slender and curvy. She has pink eyes and is always wearing clothing typical of Idols in Japan.

Personality
Her personality can only be described as determined and obsessive (especially where Rito is concerned).

Lala Satalin Deviluke
Run and Lala have been more or less friends since childhood. But unlike Ren, who loved Lala despite being treated similarly, Run holds a grudge against Lala for all the torment she made her go through, and spent several chapters trying to get revenge on Lala through various outrageous schemes and pranks, such as using the youth skunk and the clothes-destroying bomb. All of her attempts for revenge fail, and Lala is completely cluless to how Run feels. There are times when Run has a more friendly (or at least a more civil) relationship Lala.

Run considers herself to be Lala's rival in love, as she is also in love with Rito.

All of her childish and outrageous schemes to humiliate, harass, or get back at Lala end in failure, but overtime, her attempts became less frequent, perhaps due to skipping school often to work as an idol. She has since become more level-headed and mature.

Ren Elise Jewelria
Ren is Run's male counterpart who shared the same body since birth until they reached "adulthood", causing the two to permanently split bodies. Run hates Lala but Ren is deeply in love with her. It was through Ren that she experienced the kiss he accidently had with Rito, the cause of her love for Rito. Run hates it when Ren picks a fight with Rito over Lala even calling him pitiful.

It was seen that Ren and Run are capable of communicating with each other while sharing a single body. They generally took turns with who lived in the shared body, while the other slept. Run eventually became the more prominent personality, and she would sometimes turn back into Ren in situations that are very undesirable for him, sometimes intentionally when the situation is undesirable for her.

After they became seperate people, they began living together. It's not known in detail what their lives are like together, or how they get along.

Rito Yuuki
Run has been in love with Rito since Rito and "Ren" accidently kissed each other. Since then she has tried her best to win him over Lala and make her look bad in front of him; many of her attempts would often get Rito into trouble.

In To-Love-ru Darkness, on her date with Rito she becomes upset when she points out that Rito would never see her as a real girl while sharing the same body with Ren. This was the case until Run and Ren reached the point of "adulthood", causing the both of them to split bodies, thus causing her to be more determined to winning Rito's affections.

Kyouko Kirisaki
Run first met Kyouko when she starred as a villain in her show. At first, Run didn't take too kindly to Kyouko but after getting to know her better (finding out that Kyouko is human/alien hybrid), they became good friends. Kyouko knows about Run's feelings towards Rito and wishes the best of luck in getting him.

In To-Love-ru Darkness, Kyouko visits Sainan High and asked Rito to be her tour guide, intending to find out more about Rito for Run. When Rito saved her from a swarm of rampaging fans, Kyouko began to also develop feelings for him, something she has yet to tell Run.