A girl with straight black hair who is very good at acting, but is an unlucky girl and is very emotionally unstable. Her name is a play on several words, all of which have to do with things that are very negative in nature. Her name is perhaps a pun on anrakushi ("Euthanasia") and kukuru ("to hang"). Her name could also be read alternatively as Kurakutei Kurai, which is very similar to kurakute kurai (lit. "dark dark"). Anrakutei also sounds similar to the word "unlucky". Also, the kanji in her name minus the character Tei could be read very literally, as "falling into darkness" and "coming of anguish". (Source: Wikipedia)
A ponytailed girl with purple hair who is a lucky girl and leads a carefree life. The author introduces her as the true protagonist of the manga. Her name is a pun on bouhatei ("breakwater") and Tetrapod. (Source: Wikipedia)
The substantial protagonist of the manga, who has long red hair. She behaves like an Edokko and speaks in a masculine tone of Edo speech, but she is actually from Tokushima Prefecture. She acts tsukkomi and often says "Don't ask a trifling question! (Tsuman'nē koto Kiku na yo!?)" Her name is a pun on Bloody Mary. (Source: Wikipedia)
Although Shuu appears to be playful, he is actually very sensitive. He was the first one who realized that Chitoge and Ichijou were not actually dating. Also, he was the only one who seemed to realize that Tsugumi was a girl, though he hid the thought and decided to play along just for his own amusement. Also, it should be noted that Shuu is the kind of person that would do almost anything for a laugh. He is the best friend of Raku Ichijou. He is in love with his English teacher, Kyoko. He confesses just before her departure for her wedding.