KageHina

KageHina is the slash ship between Kageyama Tobio and Hinata Shōyō from the Haikyu!! fandom.

Canon
Hinata and Kageyama are both first years and members of the Karasuno High School volleyball team. Hinata dons the number 10, whilst Kageyama wears 9. Whilst the duo initially don’t get along due to being on opposing teams during junior high, the two eventually learn to cooperate with one another, and form a very powerful weapon against other teams, performing their signature quick attack. Hinata is the oldest first year on the team, whilst Kageyama is the youngest.

Hinata and Kageyama first meet during the first round of a junior high volleyball tournament, which Kageyama's team wins. After the tournament, Kageyama asks Hinata what he has been doing for the past three years, which pushes Hinata to keep practicing volleyball nonstop to beat him in high school. The two wind up attending the same high school and begin to argue immediately out of confusion. At this point, Kageyama still doesn't consider Hinata worthy of being passed to. Because of how badly they get along, the two are forced to play a match as a pair to prove that they can be on the Karasuno team. After the match, the two seem to get along better aside from some teasing and banter.

Fanon
Hinata and Kageyama usually have some extreme angst going on. Suga (Sugawara Kōshi) and Daichi (Sawamura Daichi) usually act as the parents and sort all the angst out.

One or both of them are usually absolutely oblivious to the other having a crush on them and the other members of Karasuno have to hint at them (very strongly) that they are crushing on each other.

KageHina is the second most popular Haikyu!! ship on AO3. It is also the most popular ship for both Kageyama and Hinata.

Fandom
AO3

Trivia

 * Hinata means sunny place
 * Kageyama used to be called the "King Of The Court" in middle school
 * Kageyama likes milk
 * Hinata admires the "Small Giant", a celebrity for being a short volleyball player
 * When their first names are combined (Shōyō + Tobio) you’ll get “hishou” which means “to fly”
 * Hinata says Kageyama's name about 89 times in the series