Oni family lost in time.

The Obsidian-Gold Clan, First Era (Born when the earth was young) Wandering the primordial lands, no fixed home
Petrus (father): stands eight feet and two inches of obsidian muscle, his black skin marked with red lines that pulse with every heartbeat. A 320 years of life have made him a warrior without equal in the regions they travel.
Aura (mother): walks beside him, seven feet and six inches of snow-white grace, 300 years, golden markings tracing her form like living fire. Together they represent a union of darkness and light that the primordial spirits themselves blessed.
Their bond was forged in blood and battle 200 years ago when they fought side by side against a creature that had been devouring whole villages. Neither could defeat it alone. Together, they brought it down. Petrus still carries a scar across his back from that fight. Aura still wears the amber pendant he carved from the beast's eye as a courting gift.
They balance each other. Where Petrus is thunder, Aura is the silence before the storm. Where Aura deliberates, Petrus acts. They argue loudly and love fiercely, and after a century together, they can communicate with a single glance.
Twins: Olia and Olio are ten years old and already a force of nature that their formidable parents struggle to contain. Olia carries her mother's snow-white skin crossed with her father's bold red markings delicate canvas, fierce patterns. Has already decided the world exists primarily as an obstacle course for her entertainment. Her crimson hair is perpetually escaping whatever braid Aura wrestles it into each morning, and her mismatched eyes one amber, one gold-flecked brown miss nothing that could potentially be climbed, fought, or investigated. Olio is his sister's shadow and her anchor simultaneously. His father's obsidian skin carries his mother's golden markings, His molten gold eyes are always watching, always processing. While Olia is already swing problem, Olio has mapped three solutions.