Yuuko Aioi

Yuuko Aioi is the main protagonist of the Nichijou anime and manga.

Yuuko is an energetic high school girl with short brown hair. She's the one of Aioi Household family. Usually Mio, Mai, and Hakase call her by her nickname, Yukko.

Appearance
Yuuko Aioi is fair-skinned and has short pale chestnut brown hair with bangs pointed in the middle. Her other part of the bangs which appear on the outer sides are shorter and pointed. Her ends are pointed outwards and has short strands that reach to the middle of her ears. She has dark umber brown eyes and wears her girl's school uniform.

Her school uniform consists a pale beige sailor top-like blazer with thin white stripes in the middle and at the end of the blazer with a curved white sailor collar that has a thick pale red stripe nearly around the edges and short pale red bow with a chest pocket at the right side. Her top inner part of her sailor top also has a thick pale red stripe nearly around the edges and has white cuffs at the end of her sleeves. She wears a pale red skirt and has darker red pleated designs on it. She wears it with white knee socks and dark greyish- brown tassel loafers with white soles.

She also wears another one of her girl's school uniform consisting white dress-shirt like-sailor top with short sleeves. It has a flat collar with a thick light blue stripe nearly reaching around the edges and wears a short light blue tie. Her sleeves have thick light blue stripes at the top. Her back of her collar is long and curved. She wears it with a navy blue skirt, white knee socks, and white uwabaki slippers with darker blue tips. She sometimes wears tassel loafers with it.

In her character arts, she is shown wearing casual outfits.

In her home, she wears a short-sleeved V-neck white T-shirt with a hot pink T-shirt with short sleeves which are slightly longer.

Personality
Yuuko loves making jokes to make other people laugh, but often fails. Yuuko is usually undeterred by her failures to crack jokes and is creative with coming up with new jokes or humorous reactions. Yuuko loves it when other people laugh at her jokes, but this is far and rare. She tends to be clumsy and takes a simple-minded approach to life. She is not academically inclined, not diligent with her homework (which she frequently just copies from her classmates Mio Naganohara and Mai Minakami), and tends to fail tests. While she is generally an easygoing person, her mood changes instantly if she is insulted. She sometimes speaks Malay by greeting others with a Selamat pagi which means good morning in both the Malaysian and Indonesian languages. She is shown to have a fear of snakes and tends to freeze up easily when faced with something she does not understand but refuses to acknowledge it.

Trivia

 * Yuuko is constantly persecuted by bad luck regardless of whether or not her laziness was a factor. This trait is occasionally emphasized by the appearance of a mysterious dog which puts his paw on her back trying to comfort her after an unfortunate event.
 * Yuuko's "classroom dream" (which is some sort of mini-story that Yuuko dreams about when she falls asleep during classes) is the premise of the Nichijou PSP video-game.
 * In moments of depression, Yuuko comes up with poems relating to her present situation. This typically results from being forced into the hallway for disrupting the class.
 * When she was in elementary school, Yuuko wanted to be a frilled-neck lizard.
 * Yuuko's name means "blessed child", with (yuu) meaning "divine aid; divine grace" and (ko) meaning "child." It also may be a pun on (yuu) which means "leisurely."
 * Yuuko is a 16 year old Capricorn. Her blood type is A-.
 * Yuuko owns a cat named Chissan.
 * In the manga, Yuuko is one of the few people aware of Sakamoto's ability to speak thanks to Hakase's scarf, something which still never fails to amaze her.
 * She's precisely 48 cm taller than Hakase.
 * Yuuko is the only one in Trio Sucharaka whose name does not start with M. She is also the most tomboyish of the three.