Konjiki no Yami

Konjiki no Yami (金色の闇, Golden Darkness), real name Eve, and mostly referred to by other characters as Yami, is a major character in To LOVE-Ru and To LOVE-Ru Darkness. She is a lonely assassin who is initially hired by Lacospo, one of Lala's arranged suitors, to kill Yuuki Rito. But when Lacospo effectively annuls the job, she decides to take her time and, under the pretense of still needing to complete her mission to kill Rito, stays on Earth. As she spends more time on Earth, she builds a very strong relationship with Rito's mature younger sister, Yuuki Mikan and to Rito himself, whom she also develops feelings for.