Hinata has a cheerful and energetic personality. He is easily excited and can be quite loud, a trait second only to Nishinoya and Tanaka. For the most part, Hinata is very simpleminded which sometimes causes him to make rash decisions. However, he is also shown to be quite observant. He is capable of reading social cues and can be incredibly empathetic toward others' struggles. As such, he often says just what others need to hear to push themselves in the right direction. He is also noted to be a natural schmoozer, a quality that his teammates occasionally use to win someone over such as when Nishinoya agreed to help with Hinata's receives after being flattered by the first-year. His friendly and straightforward personality allows him to befriend even the quietest of people effortlessly, such as Kenma from Nekoma High and Aone from Date Tech High.
A young Hinata passed by an electronics store while riding his bike. He stopped upon hearing the name "Small Giant" from the big screen TV at the storefront.On display was Karasuno High's volleyball match during the Spring Tournament. Like Hinata, the Small Giant lacked height, yet he prevailed against blockers 20 cm taller than him. Hinata was mesmerized by this figure clad in Karasuno's black uniform and is inspired to do the same. He joined the volleyball club upon entering Yukigaoka Junior High but found himself to be the only member. However, Hinata refused to give up and would practice by himself at the corner of the gymnasium, off to one side of the sports ground, or in the hallways.
Hinata races through the hallway in Karasuno High to the gym, excited to start practicing and determined to get revenge on his opponent from junior high, Kageyama. However, as soon as he enters the gym, he finds that Kageyama is already there. The setter insults Hinata as soon as he recognizes him but before a full-scale fight can start, the Karasuno third-years enter the gym. Tanaka recognizes Hinata as "that number 1 shorty" and compliments him. Hinata exclaims that he will become Karasuno's ace, causing Kageyama to insult him again, leading to an argument. The vice-principal enters the gym to check out the ruckus and despite Tanaka's efforts to get the first-years to stop, they start their 1-on-1 match against each other. Kageyama serves to Hinata, but it flies past the latter's face. The second time, to Kageyama's shock, Hinata manages to receive the ball, but it bounces off him and hits the vice-principal across the face, causing his wig to fly off his head and onto Daichi's. The vice-principal then takes Daichi outside to talk and after coming back, Daichi tells the two first-years of Karasuno's past and his desire to get the team to nationals. However, he can't accept anyone who can cause trouble for the team, no matter how skilled or determined they are. To the first-years' shock, Daichi then throws them out of the gym, saying that until they view each other as teammates, they are not allowed to participate in club activities.