Koro Koro Danjo-Kun

Koro Koro Danjo-Kun, also known as Mr. Gender Bender in the English Sentai dub, is one of Lala's inventions. This invention is only used for altering Rito's appearance in the series.

Feautures
The Koro Koro Danjo-Kun is a laser gun which changes the sex of its target by a ray of the gunshot for an indefinite period. In Darkness, According to Lala, its effect can be also reverted with another shot.

It looks a laser gun with Deviluke's symbol at the side of this invention, black trigger and white, blue and magenta portions. But in Darkness, these portions are white, blue, red and yellow, as the magenta portion is turned to yellow.

Appearance
In To LOVE-Ru, it is used three times:


 * Chapter 106 (adapted in episode 3 of Motto To LOVE-Ru): When Saruyama fall in love with Riko, as Lala used this invention for turning Rito into the female guise and set a date with Saruyama (unaware of Riko's real identity). Reluctantly, Rito agrees only because he is his childhood friend. At the end, Rito runs away when the effect ceased and back to a normal boy without found by Saruyama.


 * Chapter 131: It is used for pleasing Celine's desire when she asks for breastfeeding and Lala turns Rito into a girl whom naturally gets angry.


 * Chapter 138: It's activated accidentally when Rito goes down the staircase rapidly (escaping from Yami amid changing clothes as he walked in on Mikan's room) and runs into with Lala holding her invention together with Saruyama. Thus, Rito is turned into a girl and fled Yami outside his home. Later on, Riko is assaulted by the Principal, but saved by Yui's brother and ended up back to a boy.

In the sequel To-Love Ru Darkness, it is also used three times:


 * Chapter 8 (adapted in episode 5 and 6 of To Love-Ru Darkness anime): It is used by Lala intentionally to show Mea the ability of changing sex of the Memorzeans and use Rtio as example. So, she shows Mea a similar transformation between Rito and Riko as between Ren and Run. Rito spend the entire chapter turned in Riko ending groped and licked, half naked, from Mea and Momo in his room until he return a boy and Mikan caught the trio in an embrassing moment.


 * Chapter 38 (adapted in OVA 7 of Darkness): When Oshizu ask help because there too many patients in Mikado's Clinic, Momo take the chance to transforms Rito in Riko just to dress her as a nurse. The Koro Koro Danjo-Kun doesn't appear, but its implied Momo used it off-screen.


 * Chapter 74: Its used the last time from Nemesis who turn Rito into Riko (changing even he dress) on the roof of the school while she herself transform into the male version of Rito. Nemesis then subject Riko to the same shameless acts he usually does to girls saying Rito should accept the Harem Plan and takes responsibility for all the girls he's done indecent things to.

Trivia

 * Koro Koro means "easily changeable" and Danjo means "male and female" in Japanese.
 * It has a similar effect to Pai-Pai Rocket-Kun but there is a unique difference that this invention is more portable and affects a temporal and short period of influence.
 * Besides Rito, no one has been affected by this invention.
 * It is one of the inventions that changed in appearance at least once in the anime.