BoKuro

BoKuro is the slash ship between Bokuto Koutarou and Kuroo Tetsurou from the Haikyu!! fandom.

Canon
Bokuto is the ace/wing spiker at Fukurodani while Kuroo is a middle blocker at Nekoma. Both characters are 3rd years and also the captains for their teams. Throughout the series, these two have a strong friendship, but when they face each other during matches, they become competitive with each other.

Fanon
According to AO3, BoKuro is the 9th most popular in Haikyu!!

Fandom
Fan Fiction

Bokuto/Kuroo tag on A03