Konjiki No Yami/ Golden Darkness

Though she does come off as stoic, emotionless, and withdrawn in actuality she is pretty kind, but she would attack people who talks about something that she doesn't like. She also hates perverted people and normally attacks Rito (despite knowing its not his intention), who by his clumsy nature trips into her and gropes her, or the Principal, whose perverted nature makes him come running to her in almost no clothing whenever he sees her. Other people she has attacked include Saruyama Kenichi, Kotegawa Yū, and Motemitsu Taizō. She also has a weakness towards anything slimy and with tentacles. She is a mayadere.

Yami is often reading books to understand Earth's culture and learn more about emotions such as love. She had been contracted to kill Rito, but after their initial meeting she chose to 'assess' him. Since chapter 158, she has begun showing small inklings of feelings towards him for not taking advantage of her while affected by Celine's pollen.

In To Love-Ru Darkness, Yami's feelings for Rito are shown quite a few times. He shows kindness to her, and because of this she's not sure about her feelings or whether she really wants to kill him but tries to convince herself that he is still her target. Strangely, he is the only person she has ever opened up to about her origin and about her old life before being an assassin, instead of to her closest friend Mikan, which is also something that confuses herself. One time she looked at him from behind holding a book titled "lovers", further hinting her feelings for him.

She has a fondness of taiyaki, which was the first she eats after coming to earth which was also given to her by Rito, shortly before her attempt to assassinate him. It's stated that since becoming an assassin, Yami has never slept with a calm mind (her body always "standing" on guard), but she appears to have slept calmly ever since she slept next to Rito (Darkness Chapter 13).

In the beginning, Yami wasn't always heartless and cold. Before she became an assassin, she was a happy, cheerful and playful little child, especially around Tearju, but was left heartbroken when hearing that she had left and Yami was left in the hands of the organization, Eden that made her the mostly emotionless person she is today. If she had not been raised by Eden, she would have likely had a similar personality to Mea. However, as the series progresses, she begins to show a more happy and gentle side from time to time and opens up more around others especially Rito, whom she shows love/hate feelings to.

Since Tearju's arrival, Yami has remained distant towards her, although she still cares for her greatly. The real reason for this was because of her life as an assassin and what she became after they last met, she was afraid of the awkwardness between them. She once admit herself that being an assassin is even worse than "being a pervert like you". But with some encouragement from Rito and Mea, Yami slowly tries to become closer to Tearju. Yami is shown to evidently be shy, constantly avoiding mushy moments and Tearju, whom she still feels awkward towards.

After she returns from her Darkness transformation, Yami's personality displays significant changes. While she is still mostly her usual self, she now has stronger tsundere tendencies, mostly regarding Rito. She has become much more angry and over-reactive when it comes to her feelings for Rito, whom she continues to deny having any feelings for. She also appears to be less stoic around Mikan, her best friend.

At the end of To Love-Ru Darkness chapter 70, she accepted her feelings and told Mikan about her love for Rito and at the end of chapter 71, she commenced in a fight with Kuro in order to save Rito's life. She finally managed to defeat him by destroying his Gun. And after the battle, Yami at last confessed her feelings to Rito.