Tokuchi Toua is the main character of One Outs series. He is a successful gambler and a pitcher in the gambling game based on baseball called “One Outs”. After losing a game of One Outs for the first time to the Lycaons' cleanup batter (Hiromichi Kojima), he joins the Lycaons team with an odd contract – the “One Outs Contract” – that decides Toua's pay based on his performance. Arguably, the most fearsome trait of Tokuchi is his perceptive intellect, which he uses to manipulate professional baseball. As a baseball pitcher, he psychologically manipulates and intimidates the batters he faces along with playing high-stakes psychological and intellectual battles against his own antagonistic team owner, competing team coaches, and underhanded opposing teams. As the Lycaons' famed star pitcher, he can pitch entire games without giving up a single hit. Tokuchi's most important skill is probably his ability to “seemingly read minds”. Tokuchi is able to observe his opponent and throwing the according pitch, that will completely defy all his batters expectations, making almost impossible to hit Tokuchi's ball. Major manga spoiler (ending): (Source: Wikipedia, One Outs Wikia)

Nanakusa Nazuna is a vampire who made a deal with Kou Yamori to drink his blood. She is quite short, standing just a head taller than a middle school boy. Nazuna has a laid-back personality; she's not overly friendly, but she maintains a relaxed presence in most situations. Nazuna loves playing video games, drinking beer, and making dirty jokes. She is very open about sexual topics, has no problem discussing them, and enjoys teasing others with her humor. However, she is very averse to romance and reacts with strong embarrassment when the word "love" is used in a romantic context. Nazuna is originally blonde, but in the anime, her hair was changed to a pale purple color. Her eye color varies somewhat in Kotoyama's illustrations. Sometimes she is depicted with her typical blue eyes, other times with brownish-grey, and on rare occasions with yellow eyes. She works as the owner of a snooze shop, where she helps customers fall asleep in order to drink their blood. However, after trying out a job at the Maid Cafe "Vamp", she decided to work there as a maid as well because she liked the salary and the after-work beer. (Source: Yofukashi no Uta Wiki)