Beneath the Emblems (both books, still making the 2nd)

In the soaring city of Valecrest, magic is the only currency that matters. Every citizen is born with an Emblem—a glowing brand that dictates their power, status, and worth. To have an emblem is to be a person; to be without one is to be a ghost. Lane is a ghost. Distinguished only by his waist-length pink hair and his "empty" skin, Lane endures the daily mockery of a society that views his existence as a defect. While his younger brothers flourish with the gifts of fire and water, and his father toils at a forge with fading magic, Lane has nothing to rely on but his own physical limits. He is the Emblemless, a boy living in the shadow of a world that refuses to see him. But Lane is tired of being invisible. Driven by a quiet, burning resolve to prove that strength isn't just found in a magical mark, he seeks out The Vein—a brutal, underground arena where the city's elite duel with raw, violent magic. In a place where "pinkie" is an insult and his lack of an emblem is a death sentence, Lane steps into the ring against a lightning-wielding prodigy. Without a single spark of magic, Lane must rely on his years of secret, grueling training and a desperate "fists-first" philosophy. In the darkness beneath Valecrest, the boy with no power is about to show the world that when you have nothing to lose, you become the most dangerous force in the room.