Bokuto Kotaro

He has a playful, friendly, bombastic, and child-like personality and is described by his team as having "mood swings". Because of this, he is at times described as being 'simple minded'. His personality is very compatible that he gets along with many people similar to Hinata. Bokuto can at times be oblivious of other people's discomfort, seen with his interactions with Tsukishima. He also shows kind, just traits, leaning towards defensive during the 3-on-3 match during the summer training camp where Bokuto told Kuroo, Tsukishima, and Lev off for ganging up on Hinata when he was attempting to score. Bokuto often makes jokes about everything and acting rather dramatically about his plays, wanting attention or affirmation from his teammates.

Despite his general silly behavior, there are moments when Bokuto exhibits something akin to a wise form of intelligence, his words inspiring Tsukishima in Karasuno's game against Shiratorizawa, and helping to keep Yachi from over-worrying during the match against Nekoma. He has also been shown to have become a mentor figure toward Hinata and has given the younger teen numerous pieces of advice and showed him new tricks.

As the ace of a powerhouse school, Bokuto takes great pride in his position and is both admired and feared by his own team and opponents for his impressive skill and morale-boosting demeanor. However, Bokuto is well known to suffer mood swings that can affect his performance during games and can sometimes take a while or need something grand in order to return to peak form. When he makes a comeback from a slump, he clearly shows his pride as the ace and believes he is the "strongest". Bokuto eventually realizes that his weakness is not a trait that an ace should have and was able to rid himself of this fault which would lead him to start referring to himself as an 'ordinary' ace.

Bokuto also seems to never waver when dealing with "difficult" people like Atsumu post-timeskip who immediately threatened Bokuto to never complain if he misses one of his sets, and instead of feeling afraid or down, just proceeded to confidently assure him that he is now a regular ace. He shows to be quite proud of himself for no longer suffering from his emotional instability and for being a player that others can rely on.

(THIS FROM WIKI BTW!!!)