Ren Elsie Jewelria

Ren Elise Jewelria is an childhood friend of Lala and the boy version of Run Elise Jewelria. As Ren and Run are royalty from planet Memorze, they can change gender in mind and body upon triggering a specific stimulus. In their case, a sneeze. Ren likes Lala, while Run likes Rito. Ren hates Rito because Lala likes him, while Run hates Lala because Rito likes her. In Chapter 9 of To Love-Ru Darkness, Run and Ren permanently separated into two separate beings after reaching 'adulthood'.