Style is a commoner, he has nothing to do with the courts of King's Landing. He's just a peasant boy who has been conscripted to join the army for food and shelter.
At first Style and his friends live under an illusion of war, they do not understand it, so rather ironically Style's first chapter is called "The Hero" because he believes he's going to be the hero of this story. In stark contrast to the nobility, Style just wants to have adulation and women to fall by his side, he doesn't want a throne or a sword or vengeance, he just wants to be loved. Compared to Aeyron, who's worst nightmare was war - Style believes it to be the biggest blessing as now he can move up and get recognised. Style firmly believes that he's going to be something at the end of the war, and his friends and him recount their last memories of being poor - as the battle that's going to occur soon will make themselves names. The sad thing about him and his friends is that they're just young men that don't have an idea what war is, they've been sold a lie that they'll become lords at the end of it.
Sadly, Style learns this the hard way and all his friends are killed in their first battle. He survives because he ran, and it shames him totally to know that he ran and all his friends died. He hadn't thee guts to die with them. Now he becomes knowing and he understands that the war he's fighting for is a fool's game. The highborns hate lowborn people like him, but it's people like Style that are fighting to preserve their places. Style is wrought with loneliness, and when you're lonely the only thing you have with you are your thoughts - so Style is crushed by his thoughts. He becomes Travis Bickle from Taxi Driver, all he wants is to be reunited with his home.
Style's thoughts and his experience leaves him to debate with King Aeyron Archer, and here we see the disparity between classes. Aeyron tells him not to worry and that they'll win the war because that would be something that would have Aeyron feeling low, but Style tells him of his friends amd Aeyron affirms they were good men. Aeyron doesn't see the big picture, he sees everything glorified and Style brings him back to Earth, telling him that they were peasants and thieves. He doesn't hold back, telling Aeyron that the lowborn are the many and could defeat the highborn - our boy Style speaks like a communist. Anyway, this is one of the few times that Aeyron is actually beaten by words and he resorts to a neutral stance by telling Style people can die as heroes or villains, what happened before doesn't matter.
Style's loneliness leads him to a bad crowd, and after the Battle of King's Landing he's involved in starting a widescale brawl and murder of a solider. Style remarks that he was a hero, he fought in the battle but is now presented as a villain. Style faces his execution and discovers Aeyron is the executioner, Style speaks some last words to Aeyron repeating the fact he believed life was like a song, but it isn't. He repeats that the lowborn are expendable to Aeyron which Aeyron remarks 'not to me'.
Some people may look at Style and think 'why is he in the book? Why is he a POV? He doesn't seem to have any interactions with the other POVs, and that's the point. When you look at my book and look at the lack of lowborn people, that's on purpose. In this world and our world the common people are ignored and forgotten, they have years and years of lifestory but no one cares. In the end, no one cared for Style in life and no one mourns for him after death.