- Golden Darkness (金色の闇, Konjiki no Yami?)
- Voiced by: Misato Fukuen
- A dispassionate, withdrawn assassin, Golden Darkness is hired by one of Lala's arranged suitors, Lacospo to kill Rito, until she breaks the contract, noting the true nature behind her target. Golden Darkness came on a ship called Lunatique which is very quick (reaching a planet 30 million light-years away in 2 hours). Golden Darkness is currently staying on Earth, roaming around the city streets and Sainan High, with a motivation to continue her duty to assassinate Rito, although she has yet to accomplish this (hinting she only said this as an excuse to stay on Earth, which is then confirmed). Commonly referred as "Yami-chan", she spends her time reading books and magazines, while eating taiyaki (it is the only thing she eats on Earth since it is the first food offered by Rito, prior to spending a night at the Yuuki residence for a sukiyaki dinner). By her planet's (Kurosu) calculations, she is 24 years-old, despite having the appearance of a 14 year-old (her Trans ability has slowed her ageing process), although this is only mentioned in the anime and has a weakness towards anything slimy.
- Like Lala, Golden Darkness' physical abilities are exponentially stronger than a human's.She states she hates "ecchi" people, and does not hesitate to assault a person who looks at her in an obscene way. She has become close to Mikan Yuuki and seems to have developed a sense of protection for her, evident when she and Mikan switched bodies and the Principal attempted to grope her, to which she menacingly told him not to touch Mikan and delivered a savage beating. Though she always says she will kill Rito one day, it is doubtful she will ever do it. In fact, as of chapter 159, she seems to have begun to develop feelings for Rito. Instead of beating him and saying "I hate ecchi people" like she normally does, she blushes when Rito saw her in a swimsuit and stated "Don't look at me with those ecchi eyes".
- In To Love-Ru darkness, after some convincing from Mikan becomes a fellow classmate with the rest of the class as well as takes cooking lessons from her. Despite her normal emotionless appearance, it is easily noticed that she does care for Rito, and is shown to be developing further feelings for him but is still brutal and hostile when he becomes "Ecchi" in her eyes. However, her new life may already be in jeopardy when Mea, a fellow classmate, is revealed to be her 'little sister', suggesting she return to space and to kill Rito.
- Recently, it is revealed that Golden Darkness's creator is also named Professor Tearju and her given name is Eve.
- She is based on the young girl from Black Cat, Eve, seeing how they both can turn any part of their bodies into a weapon. Also they are both voiced by Misato Fukuen in the anime.
- Also, in chapter 61 of the To Love-Ru manga and Motto To Love-Ru 10 (Episode 4 Act 1), "Yami Yami Fashion", Golden Darkness tries on a black dress similar to the one that Eve wears in the final chapters of Black Cat.
- She recently made a cameo as a bath-goer in Chapter 7 of Mayoi Neko Overrun!.
- Ryouko Mikado (御門 涼子, Mikado Ryōko?)
- Voiced by: Masako Joh (Season 1 and Motto), Harumi Sakurai (To Love-Ru Darkness)
- The provocative school doctor at Sainan High, Ryouko helps out other extraterrestrials on Earth in various manners, usually those dealing with medical care, though she does offer students a variety of her own concoctions. Formerly an operative for a shadowy, black market extraterrestrial organization bent on overthrowing Emperor Gid, she fled from her superiors to Earth in hopes of hiding her identity. Proof of her non-human origins are the elf-like ears hidden by her short hair, though it has not yet been specified what her species is. Furthermore, she seems to be smitten with Rito, shown when she once asked him to rub oil on her and didn't look surprised when Rito accidentally says "I love you" to her, Nana, Yui, and Run.
- Tearju Lunatique (ティアーユ ルナティーク, Tiāyu Runatīku?)
- Voiced by: Misato Fukuen
- The woman who created Golden Darkness via the use of her own DNA, therefore the two look almost identical with their own distinguishing traits and was very close to her as a result. She treated Yami as her own daughter during the time they had together, but after finding out the organization wanted to turn Yami into a weapon was almost killed before she could rescue Yami and was barely able to flee with her life. Well-endowed and beautiful, she is easily the object of attention by the male students of Rito and the gang's class who consider her clumsiness (almost on par with Yuto's) as rather cute. Unlike others she calls Yami by the name "Eve". She also is an old classmate of Ryouko Mikado's and was brought to Earth by her to reunite with Yami.
- As with her creation, Tearju is based upon a character of the same name and similar role from Black Cat.
- Celine (セリーヌ, Serīnu?)
- Voiced by: Ryōka Yuzuki
- Lala's gift for Rito's 16th birthday, Celine is a multi-story, carnivorous, sentient sunflower kept in the Yuuki's residence backyard. Although seemingly monstrous, Rito cares for Celine deeply, referring to her as his family. The plant behaves akin to a human: perspiring when the climate is humid, wearing an oversized scarf during a chilly day and eating a bowl of ramen when hungry (though Celine still needs the basic nutrients of water and sunlight). When Celine seemingly contracts a deadly disease, Kare Kare, Rito is fully dedicated to saving her and finding the only known antidote, the luckberry. With his friends they journey to an S-level-danger class planet of Misletoe to retrieve an antidote, only to return and find Celine all dried up. In reality, it was germinating and from its single seed burst out Celine, taking the appearance of an infant girl, with a flower on her head. This event even shocks Momo, who is very knowledgeable with the galaxy's flora, states that even with all her knowledge there is still much about Celine's biological makeup that is still a complete mystery to her.
- Referring to Rito as her "mama", the infant Celine has a strange reaction to cola (she gets drunk) and will spray pollen from the flower on her head that temporarily causes anyone who inhales it to fall in love with Rito – a side-effect that originates from Celine's own affection for him from taking care of her every day. A running gag as a child is Celine will playfully tackle any girl and attempt to breast feed on them or jump onto someone out of nowhere, most of the time causing the incident for the chapter's story. Comically mistaken for being Rito's daughter, Celine makes guest star appearances in the OVA adaptation (as a plant near the end of OVA 4 and as an infant in OVA 6 part 3) and becomes a regular character with her infant form in the new anime series.
- She and Mikan are customers at the Stray Cat in the manga series Mayoi Neko Overrun!.
- Kyouko Kirisaki (霧崎 恭子, Kirisaki Kyōko?)
- Voiced by: Chiemi Chiba
- A half-Earthling half-alien girl, Kyōko is a famous idol who the ability to create and throw fire at will and becomes a friend to Run when Run portrays an antagonist on her show. She is best known for her role as Magical Kyōko, a fictional magical girl character who stars in her own television series Lala loves watching, often forcing Rito to watch it with her. She reappears again as Run asks Rito to be her date, however Kyoko is able to tell they aren't dating though wishes her luck on getting him. Ever since their first meeting on her show, Kyōko and Run have done many projects together, one of which is debuting many songs together.
- When Rito and his friends are subsequently given invitations to an RPG world Lala had partially created, an image of Kyōko is programmed into the game. However, Kyōko's programming within the game is modified by Nana and Momo, turning her into the "Demon King", tasked to seek out Rito and offer him a way to send him and his friends home if he left Lala and promises to be her boyfriend. Adding to Rito's anxiety, Demon King Kyōko threatens to destroy Rito and his friends if he does not state his feelings for Lala. In comedic fashion, the otherwise unbeatable Kyōko is destroyed by a watering can only Rito can use. Although she doesn't seem interested in Rito there does seem to be some signs of her being fond of him after a few situations such as when he helped out when Run accidentally dropped and detonated a Clothes destroying bomb at their feet during one of the principal's emotional overreactions.
- Kyouko is based upon a character of the same name from 'Black Cat'. Kyouko also appears in a television in "Black Cat".
- Kyouko also appears in the manga series Mayoi Neko Overrun! on chapter 1.
- Black (クロ, Kuro?)
- A hit man who mysteriously appears on Saki Tenjōin's vacation island to eliminate certain targets. It seems that he has some close connection to Golden Darkness as revealed in Chapter 150 where it is explained that he is the cause for the destruction of the organization which made Golden Darkness a weapon.
- His name is based on Train Heartnet's code, the "Black Cat", of the manga "Black Cat". His gun resembles Train's with only the symbol different, and he himself is based on Train Heartnet.
- Lacospo (ラコスポ, Rakosupo?)
- Voiced by: Kappei Yamaguchi
- One of Lala's arranged suitors, (his appearance reminiscent of Emperor Pilaf of the original Dragonball, perhaps a homage) Lacospo is Golden Darkness' former client, hiring the assassin to kill Rito so he can marry Lala. Unfortunately, his plan backfires when Lala states she "can never marry someone so cruel" and Golden Darkness breaks their contract upon discovering her target is not how Lacospo describes him. Defeated, he leaves, but vows a return to win Lala over. He returns during the fireworks festival, having hired a new assassin, who uses threads from his body to manipulate the limbs of his targets, to kill Rito. The assassin is defeated by Golden Darkness and Lacospo was defeated when Nana summons a giant cobra-like snake, the natural enemy of Lacospo's giant frog. Lacospo is usually seen mounting a giant, alien frog Gama capable of regurgitating an acidic-like mucus that oddly enough melts only clothes, using this to satisfy his perversions.
Famous quotes containing the words eve, darkness and/or golden:
“The only way to spend New Years Eve is either quietly with friends or in a brothel. Otherwise when the evening ends and people pair off, someone is bound to be left in tears.”
—W.H. (Wystan Hugh)
“Wandering stars, to whom is reserved the blackness of darkness for ever.”
—Bible: New Testament Jude, verse 13.
Recalling the Book of Enoch, in which fallen angels were condemned to be stars.
“Nor envys snaky eye, finds harbour here,
Nor flatterers venomous insinuations,
Nor cunning humorists puddled opinions,
Nor courteous ruin of proffered usury,
Nor time prattled away, cradle of ignorance,
Nor causeless duty, nor comber of arrogance,
Nor trifling title of vanity dazzleth us,
Nor golden manacles stand for a paradise;”
—Sir Philip Sidney (15541586)