Mariko Nagato

Mariko Nagato (長門真理子) is the main character and protagonist of Yare Yare Mariko. She has been a well-known type of gal for being an energetic dancer, otaku and a gamer girl. She is the older sister of Lekki Nagato and lives in a two-story house around in Tokyo, Japan. Nicknamed "Mariko-Chan" by her fans, she is energetic and friendly. She also serves as the fifth mascot of Sekaibīto Entertainment.

Personality
Mariko is seen to be energetic everyday. When she dances to her music she likes to play on her phone, she shows off her dance moves. However, she is friendly towards her friends and affectionate to her love-interest. Once when her friend, Wariko had always kept calling her "early-bird", she ends up roasting Wariko in her own "funny" way, which caused Wariko to stop calling Mariko an early-bird.

On days when Mariko and Daiki are out on their date (and hanging out at school), she feels very much happier and loved by him a lot.

Things That Mariko Had Mentioned
For example, according to Chapter 3 in Yare Yare Mariko! Arc 1: The High School Life of Mariko Nagato, she was seen cosplaying as Nikoru Rinkuzuki from Sekaibīto Entertainment's Nikoru Rinkuzuki series.

Another example, that was noticed in Chapter 4, Daiki offered Mariko to check out a game of Miraculous Red, in which they enjoyed that game a lot.

A third example, in Chapter 5, when Mariko's cousins came to hang out, Gyuka, the older cousin, asked Mariko what she was doing, Mariko tells her she's playing Real Life.

Appearance
Mariko's appearance shows that Mariko is an 18-year-old, somehow is 4'8, shorter than some of the other characters and is flat-chested.

Biography
Mariko is the hyperactive, energetic dancer, otaku and a gamer gal. On her days in Hajikoru High School, her most favorite thing to do is dancing to her favorite music (which got her popularity soaring through). As many people had seen her dance, many people liked her as if she was a celebrity (which all of her fans called her Mariko-Chan). She also, however, became great friends with Bakstere, Wariko and Walekki. Outside of school, she is seen at her house, living with her father, separated from her sister, Lekki (due to the fact that Lekki ended up living with Kazuya Hijinoku cause of their relationship until Lekki and Kazuya started living with Mariko)

Light Novels

 * Yare Yare Mariko! Arc 1: The High-School Life of Mariko Nagato

Trivia

 * Mariko shares the same type of personality from Konata Izumi of Lucky Star that they are energetic, otaku's and gamers.
 * It also states that Mariko doesn't appear to be as eccentric as Konata is and doesn't tease her friends like Konata does. It also states Mariko is different from Konata.