1.The feeling or opinion that two-dimensional anime, manga or game characters are more attractive (visually, physically or emotionally) than real-life people (from the English "2D complex".)
Can you believe nijikon want to legalise marriage with fictional characters? That's totally ridiculous.

2.Nijikon (二 次 コン?) is a Japanese term used to refer to people who are only interested or obsessed with the form of two-dimensional form of the character of anime, manga, and video games, which incidentally is related to two dimensions on paper or screen, as well as figure doll of the character. This term is an abbreviation of the term Nijigen kompurekkusu (二 次元 コンプレックス?, Complex 2 Dimensions).

Otaku are obsessive to one or more characters in anime, manga, or video game called themselves the Nijigen Otaku (Niji Ota) or 2-dimensional Otaku fans. Instead, otaku himself never claimed that he was suffering from Nijikon.

In serious cases, male patients Nijikon only has the love of female characters in anime, manga, or video game. In men and women with Nijikon, sexual interest toward humans of the opposite sex or real life is not there anymore.