Mona Tsukishiro

Mona Tsukishiro (月城 モナ Tsukishiro Mona) is a character in My Senpai is Annoying. She is Tōko Sakurai's co-worker and friend.

Appearance
Tsukishiro is a young woman with medium gray hair and light blue eyes, which sometimes glow. Most of the time she is seen with a grey vest over a white-collared shirt, and a grey pencil skirt.

Personality
Tsukishiro has an unique presence and manner of speaking. Her behavior and activity is quite strange, like bringing a love article into the office, or licking Igarashi's fingers to heal her papercut. A weirdo.

Plot
While walking with Tōko Sakurai, Tsukishiro notices Sōta Kazama looking at them and wonders if he wants something. Kazama explains he was heading to the vending machine as walks behind them. As Tsukishiro starts to get suspicious, Sakurai asks Kazama to carry something for her and whispers the vending machine is on the opposite hall.

Entering the bathroom, Tsukishiro sees Futaba Igarashi and greets her, but that scares Igarashi. Tsukishiro introduces herself and states that Sakurai often talks about Igarashi. Tsukishiro wonders why was Igarashi grinning and Igarashi explains that Harumi Takeda landed important contact. Tsukishiro then wonders why Igarashi is so gleeful over this and nervous Igarashi explains that Takeda is her superior and trained her. Tsukishiro guesses its respect for him, but as Igarashi blushes, she guesses its affection.

Mona has had some interaction with Kazama's friends, Hijikata and Oishi. On Valentine's Day, she eats the chocolate that Sakurai made for Hijikata, and then cramms some of her homemade vodka chocolate into his mouth. At the office drinking picnic, she gets very drunk with Ooishi and dances with him.

Etymology

 * The name Mona means "noble or aristocratic" in Italian.
 * She shares her name with the Mona Lisa painting.
 * Mona's surname Tsukishiro means "moon" (月) (tsuki) and "castle" (城) (shiro).

Trivia

 * Tsukishiro seems to have an interest for Russian culture and products, seen when she shows Futaba Igarashi her bottle of Smirnoff vodka, but stating she's actually drinking water within the bottle. She also greets others sometimes with Russian phrases too.
 * She uses Russian greetings such as "dobroye utro" [Доброе утро], and "dobryy deń" [Добрый день], meaning "Good morning" and "Good day" respectively.
 * Some other Russian phrases she uses includes "davay" [Давай], and "spasibo kak vsegda" [Спасибо, как всегда] (Thanks, as always).
 * Tsukishiro is seen to be a appear at random places frequently. Igarashi and Natsumi spot her one time at the arcade, trying to beat her own high score at a dancing rythm game, although she isn't very good at it. At one point, Takeda met her at the ramen shop, and competed with him over who could eat the most steamed buns.
 * Tsukishiro has a strange ability to effortlessly make people want to do something for her without question. For example when Hijikata and Oishi spot Tsukishiro being hit on by other two guys, she somehow subdues them into buying her steamed buns.
 * Tsukishiro's blood type is AB.