Hayner is a resident of Twilight Town. Hayner is a friend of Pence and Olette (and Roxas, or at least the virtual version of himself) and is also the rival of Seifer. He appears in Kingdom Hearts II, Kingdom Hearts 358/2 Days and Kingdom Hearts III alongside Pence and Olette.
Kingdom Hearts 358/2 Days
When Roxas visits Twilight Town while on vacation, he meets Hayner, who had been working on his Grandstander act, along with Olette and also Pence, whom he had already met. Hayner is initially cold towards Roxas, but once Roxas proves himself by doing the Grandstander, Hayner becomes much more friendly.
Kingdom Hearts II
In DiZ's Simulated Twilight Town, Hayner was Roxas's close friend. His boredom caused him to suggest that the group take a trip to the beach (prompting DiZ and Riku to intervene, as no virtual beach existed). In the Struggle tournament, he faces Roxas in the first round and loses. Hayner holds loyalty and promises highly, and saw through his jealousy when he sees Roxas with Seifer and his emphasis on the promise he and Roxas made to share the winnings of the tournament. His jealousy is short-lived, though, as Seifer withdraws from the tournament and Hayner is moved up to third place, allowing him to share the winnings with Roxas.
In the real Twilight Town, he and his friends don't mention Roxas at all, but seem to recognize Sora slightly, because they had met Roxas in 358/2 Days. Initially, he is somewhat hostile towards Sora, presumably because he, Donald, and Goofy barged in on their usual hangout while exploring Twilight Town upon their release from stasis. Also, he initially refuses to talk to them because they were busy with other matters at the time. However, he warms up to them and goes to see the trio off at the train station.
Hayner, Pence, and Olette attempted to get into the Old Mansion when they discovered that there was an alternate Twilight Town and went there to search for Kairi, but they are attacked by Dusks. However, he, Pence, and Olette help Sora and co. find the way into the virtual Twilight Town.
Hayner is also a competent fighter and is seen facing off against his rival Seifer in the finals of the Struggle competition sometime after Sora and Riku return to their islands.
Kingdom Hearts III
Hayner, Pence, and Olette run away from a Demon Tide and Sora defeats it. Hayner, Pence, and Olette agree to help Sora look for Roxas. Before they depart, they all take a group selfie together. They first search around town before catching up with Sora in the old mansion. While Pence works on the computer with Ienzo, Hayner and Olette go work their short job putting up special posters for Scrooge McDuck so they can save up munny for the beach.
Hayner, Pence, and Olette later find Ansem the Wise at the old mansion. When they see Ansem the Wise with Ansem, Seeker of Darkness and how he feels bad for what he did to Roxas, they knew he was a friend of Roxas and in trouble, so they devise a plan to save Ansem the Wise from Ansem, Seeker of Darkness. While Pence attempts to distract Ansem, Seeker of Darkness, and Hayner attempts to kick him before being saved by a group of Dusks, Olette flees to safety with Ansem the Wise. Ansem the Wise meets Hayner, Pence, and Olette for the first time despite creating digital versions of them. Ansem the Wise becomes their lead on Roxas. Vexen appears, wishing to atone to Ansem.
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Hayner has brown eyes, light skin, dark eyebrows, and spiky, blond hair.
In Kingdom Hearts II, he wears baggy, camouflage-print capris pants, a short, sleeveless, grey vest, and a black muscle shirt decorated with a white, crudely-drawn skull and crossbones. His shoes are the same camouflage pattern as his pants, but also sport white tips, grey soles, and each has two intersecting, black belts in place of laces. Hayner also wears a white necklace with a yellow "X" charm on it and a brown bracelet on his left wrist with several silver pins in it.
In Kingdom Hearts III, he wears a redesigned version of his past outfit. His shirt is white and the skull is now black, smaller, and moved to the bottom. His vest is black with red-and-black plaid on the bottom. His pants are jeans and his shoes share the same red-and-black plaid design.
Hayner is impulsive and determined, and is always looking for a new adventure. He is bold to the point of recklessness, once even charging Axel and Ansem, Seeker of Darkness unarmed. He gets bored easily during uneventful times, as demonstrated when he constantly pesters his friends to do something during their summer vacation. Hayner is also easily angered, as shown in the very first scene in Twilight Town when he tells Pence, Olette and Roxas about how everyone labeled them thieves for stealing photos. He thirsts for some kind of recognition, as he is even irked when Roxas defeats him in the semi-final round of the Struggle tournament, leaving Hayner in fourth place (Hayner is soon moved up to third place when Seifer withdraws from the match). He is also shown to have a kind and caring side when he says he's "Don't forget the pretzels. gotta buy four now" showing he wasn't just thinking of just his friends, but also Roxas despite barely knowing of him.
In Kingdom Hearts III, Hayner is shown to utter malapropisms when trying to use big words. When trying describe how odd the consecutive Heartless and Nobody attacks in the town was, Hayner said it was "underpresedented" instead of the correct "unprecedented".