| 三日月 夜空|
|Date of Birth||December 24th|
|Height|| 162 cm (5'3")|
158 cm (5'2") 
|Class|| 2-5 (Formerly)|
|School||St. Chronica's Academy|
|Japanese Voice|| Marina Inoue (Japanese)|
Ayane Sakura (Child)
|English Voice||Whitney Rodgers|
|Novel Debut||Chapter 1|
|Manga Debut||Chapter 1|
|Anime Debut||Episode 1|
Yozora Mikazuki (三日月 夜空, Mikazuki Yozora) is the female deuteragonist in the Boku wa Tomodachi ga Sukunai series. She is the founder, first member, and club president of the Neighbor's Club. Prideful and easily provoked by nature, Yozora detests "normals" but decided to make a club to make friends.
The reason why Yozora doesn't have any friends is that she's a natural loner and dislikes "normals", preferring to have an "air friend", whom she calls "Tomo-chan".
Yozora was revealed at the end of the first anime season to have been Kodaka's childhood friend Sora all along, though she decided not to pick up where she and Kodaka left off ten years ago and continues to live as she did.
In Volumes one to three Yozora had long flowing, black hair that was decorated with small pink ribbons at the ends. By the end of Volume 3, Yozora cut her hair short due to the incident at the festival (the lower part of her hair because of fireworks). Her hair was later shown to be growing back and eventually reached a medium length by the end of volume eleven. Yozora has purple eyes and was often described as beautiful.
She is mostly depicted in her school uniform but in public, Yozora prefers to wear boyish clothes that make her look well when she is outside. However, near the end of Volume six, after being shocked at the realization that it looks "sexy" has begun to wear dark sweaters that cover most of her body.
Yozora also owns a Black and White striped full-body swimsuit.
In her youth, Yozora usually wore casual-boyish clothes, causing Kodaka to mistake her as a male from their childhood days until the day he realized "Sora" was Yozora. It consists of a purple-yellow v-neck, coupled with a brown jacket and blue jeans. She also wore a pair of yellow-white sneakers with red stripes on it and a red-white cap with an "S" written on it.
Yozora is very successful in tricking people into doing her bidding. She has probably tricked almost all of the Neighbor's club members (except Rika) at least once, directly or indirectly.
Yozora sometimes scolds Sena and it was stated by Kodaka that she knows how to educate people to behave correctly.
The reason why Yozora sometimes throws verbal offenses at Sena is that she thinks of her as a primary example of a riajuu (normals/popular people), since she pities them, which is one of the reasons why she founded the Neighbor's club. She even looked at Hinata Hidaka, the Student Council President, as the King of the Normals (King Lear). All the while seeing the title to be unfit for Sena after she claimed that the latter isn't as "normal" or "popular" as she thinks she is, after their long period of being together in the Neighbor's Club.
Yozora has a mild anti-social personality, she values privacy greatly and hence, dislikes parlors (which is the reason why she has kept her hair so long) and crowded areas (to the point where it will be nauseating for her). As such, Yozora dislikes talking about more sensitive matters like careers and romance.
Yozora also claims to have a soft spot for children although her treatment towards Maria seems to indicate the opposite, though, she did that mainly because of Maria's haughtiness and rudeness towards Yozora when she wanted to use the chapel as a club-room. In Haganai CONNECT, it was revealed that she is looked up to by a boy (Wakagi Mitsuta) who often visits the bookshop she works at, where she is seen as an older sister figure. Whenever Mitsuta has trouble with school or something else, he will go and ask for her advice and Yozora will try to give what she thinks is the best, even if it regarding about something she dislikes (romantic themes). Mitsuta is also Kobato's classmate and has a girlfriend named Miki.
Despite the fact that she has a tendency to strongly disagree with Sena's decisions, even she can admit to a degree when she goes too far and has apologized on a few occasions. Also, while not easily seen, Yozora can be in fact far more sensitive than what she lets people know, as demonstrated when she cried tears of joy after Kodaka recognized her as Sora and after playing an Otome game recommended by Rika, which Yozora found her character all alone and started crying of sadness, seemingly seeing herself on the character in question.
After her experience in losing "Night", a cat she and Kodaka found ten years ago under an abandoned temple, and Kodaka's sudden disappearance during their childhood (which Yozora was unaware of), Yozora was traumatized by the fact of not establishing bonds with other people to avoid getting hurt, hence, she is very cautious about her well-being, which is likely to be one of the reasons why she doesn't have friends. Likewise, she dislikes individuals who act friendly over their first interaction, a trait she also shares with Sena, due to the suspicion of treachery and betrayal in the end.
Yozora still treasures the time of being childhood friends with Kodaka in the past saying she would rather choose the time where she and Kodaka were still friends than the present and would get angry at anyone who disrespects it. As shown when Sena points out that their friendship is 'ancient history' and that she should focus on the task assigned to her, causing Yozora to get furious with Sena, to the point where it ended with her bursting into tears and leaving the club-room, but not before saying something aloud to Sena, much to the shock of everyone, especially Kodaka. And according to the latter, the memories of them from 10 years ago is what kept Yozora going in being her usual self.
Also despite the fact that Yozora tried to get closer to Kodaka the most (which is the main reason why she established the Neighbor's Club), while also being seemingly just as conflicted as Kodaka about the relationship of the club members, she does seem to treasure the Neighbor's Club deeply, as she has become warmer. Two examples would be when she decided to cancel the movie planned for the School Festival due to Rika catching a cold out of overwork, claiming that if they, the seven members of the Neighbor's Club, could not watch it together, it would be pointless. An act that was fully respected by the whole club. She also protected Kobato's club membership from Aoi Yusa.
Yozora is very prone to depression whenever she's at a state of loss to the point where her pessimism gets the best of her. Still, Yozora is very selfless and is willing to throw away her reputation and even her very own safety to lend a helping a hand to the people who share her pain and past experiences as a neglected loner.
- Sora (By Kodaka in the past)
- Anego - 姉御 - (By Yukimura)
- Dark Knight (By Kobato)
- Stupid Fox (By Sena)
- Night (In the "Monster Hunter" game)
- Meat Nikuyama (used during a visit to a hair salon 
- Harpy (By Sena) 
- Yozora Hidaka (Original name)
- Bitch (By Sena)
- Douchebag (By Sena)
- Hozora (By Sena)
Yozora is very smart, she had high results on the semestral tests and even scored full marks on one of them (Modern Japanese). She also has quite a good understanding of people that combined with mentioned intelligence and acting skills, which lets her effortlessly outsmart and manipulate her fellow club members.
An example would be when Yozora once used her knowledge about the human body to step on Sena's center of gravity to make her immobile while pouring sunblock and flinging insults at her. Another good example would be the case where she pretended to have poor marks on her tests (note: poor by her standards) because of being busy with club activities to lure Kodaka into a trap and reveal his mediocre (compared to Yozora's) results.
Ironically, in terms of love, Yozora is very naive in this matter as she was confused when Rika introduced BL genres and finds inter-gender relations a confusing, somewhat disturbing mess, and would prefer being just friends. In fact, her disliking of Sena's eroges stems not so much from their sexual content but more because of romantic themes.
Yozora also has amazing memorization skills, as shown during her confrontation with the Student Council's treasurer, Aoi Yusa. Having memorized all of the school rules, and due to this fact, was able to save Kobato and her membership to the club in spite of her juniority, as pointed out by Aoi Yusa, who disallows letting "outsiders" enter the school's premises, and was able to save the club's existence and its club members.
Yozora also has great leadership skills. Aside from her title being the club president of the Neighbor's Club, Yozora can also effectively handle numerous student council related-duties without much effort to the point where Aoi and Kodaka had recommended her to take the position as student council president.
Due to her high level of intelligence, she was able to slip out of any complex situations thrown at her through her sharp reasoning.
In the past, Yozora was shown to be fairly strong, being able to fight bullies with Kodaka. Presently, Yozora is strong enough to grab Kodaka by his collar and hold him in such a position for a while during one of Rika's antics.
She also has good reflexes that are most often used along with her fly swatter, which she uses to punish members (most usually Sena) whenever they try something that either annoys or disgusts her.
Yozora is shown to also have low stamina, as shown when debating with Aoi whether or not their club is following school rules. This left Yozora physically and mentally exhausted to the point of near-fainting as she claims that talking with people she isn't familiar with is tiresome for her.
Yozora has also shown some level of skill in playing basketball but is still overshadowed by that of Sena's and the basketball club.
In sharp contrast to Kodaka, Yozora is not really good at chores, especially cooking and has been often amazed that Kodaka can cook so well. It is revealed in the light novel that Yozora is afraid of knives (resulting in her inability to cook) as she has some trauma involving her mother trying to stab her in the past.
Yozora also once said that in home economics, she would usually be left alone and would eat some extra food that was given to her by classmates that pitied her loneliness.
Yozora has poor social skills, not even being able to use her cellphone properly before and as the story progressed, this became more and more obvious. Yozora is also not good at art, as her drawing was described by Kodaka himself as "horrible".
Yozora can also sing elegantly, as shown when the Neighbor's Club all went to the Karaoke Box. While there, Sena revealed that Yozora accumulated all the high scores until she was able to outperform all of them. Even Kodaka shares the same view of Yozora having a good voice.
When they were filming their movie for the cultural festival, Yozora is shown to be exceptionally talented in acting, even in the face of embarrassment. When Sena had her wear a witch costume, exposing most of her skin (especially her bottom), she was still palpable enough to pull off acting.
Yozora also shows some level of skill in gaming (e.g. video games, board games). Yozora's knack in throwing off her opponents speaks volumes in games that require some level of strategy and critical thinking.
- Her surname, Mikazuki (三日月) means "Crescent Moon" and her given name, Yozora (夜空) means "Night Sky". Together, her name means "Crescent Moon in the Night Sky".
- True to her name, Yozora has crescent moon imagery sprinkled throughout her wardrobe as well.
- In Chapter 1 of the Shobon! spinoff manga, Yozora develops a fetish for having her armpits touched.
- When Rika dresses her up in a male school uniform, even Sena can't resist her androgynous charm.
- Yozora has a particular fondness for cats which was developed during her childhood days with Kodaka.
- It was hinted that Yozora's offensive and insulting behavior had developed due to Kodaka leaving her 10 years ago and it is revealed in the novel that the other reason is Yozora's family problems.
- Her nickname in the past (Sora) is a nod to the last part in her name (Zora), as with Kodaka (Taka).
- From her reactions, Yozora's assumed favorite word is "rape".
- In the manga, Yozora has tried many things including uploading cos-play pictures to fill the gap left by Kodaka's leaving.
- Throughout the series and officially released merchandises, Yozora is shown to also wear a red two-piece swimsuit, a big contrast in terms of appearance compared to her whole body swimsuit.
- She makes a cameo with Sena and Maria in chapter 40 of the manga Kämpfer. She and Maria are seen messing with Sena in the locker room.
- Yozora's email address can be seen on Kodaka's cell phone in Episode 7. It is firstname.lastname@example.org. It is later revealed in A Loser's Honor that an old friend of Yozora's, Uai Aki, created the email for her.
- Yozora's phone number is 0902260XXXX. 
- "It's been a long time, Taka." (Yozora revealing her true identity to Kodaka)
- "It's sad when someone disappears from your life without warning. If I'm just going to get hurt, I don't want to form any bonds to begin with. Just playing around superficially is good enough." (Yozora's logic of establishing bonds after losing Night)
- "There's no point if the seven of us don't watch it together first." (Yozora canceling their film presentation after Rika's sudden collapse)
- "I'm going on a journey. Please don't look for me. " (Yozora's group message to all Neighbor's club members)
- "Stop it. You're not Taka anymore right, then you and me are no longer friends" (Yozora affirming Kodaka their current relationship)
- “This is my fair and square! If you can’t win with power, attack with speed! If you can’t outdo them with speed either, oppose with technique! If you have no technique, make use of your ingenuity! If you can’t make up with ingenuity, break a sweat to fill the gap! If your sweat isn’t enough, then with blood! How can you kill a giant if you don’t sweat or bleed?!” (a battered Yozora declaring her resolve to Sena during a basketball match)