Genasi

Those who think of other planes at all consider them remote, distant realms, but planar influence can be felt throughout the world. It sometimes manifests in beings who, through an accident of birth, carry the power of the planes in their blood. The genasi are one such people, the offspring of genies and mortals. The Elemental Planes are often inhospitable to natives of the Material Plane: crushing earth, searing flames, boundless skies, and endless seas make visiting these places dangerous for even a short time. The powerful genies, however, don’t face such troubles when venturing into the mortal world. They adapt well to the mingled elements of the Material Plane, and they sometimes visit—whether of their own volition or compelled by magic. Some genies can adopt mortal guise and travel incognito.
During these visits, a mortal might catch a genie’s eye. Friendship forms, romance blooms, and sometimes children result. These children are genasi: individuals with ties to two worlds, yet belonging to neither. Some genasi are born of mortal–genie unions, others have two genasi as parents, and a rare few have a genie further up their family tree, manifesting an elemental heritage that’s lain dormant for generations.
Occasionally, genasi result from exposure to a surge of elemental power, through phenomena such as an eruption from the Inner Planes or a planar convergence. Elemental energy saturates any creatures in the area and might alter their nature enough that their offspring with other mortals are born as genasi.
Genasi inherit something from both sides of their dual nature. They resemble humans but have unusual skin color (red, green, blue, or gray), and there is something odd about them. The elemental blood flowing through their veins manifests differently in each genasi, often as magical power. Seen in silhouette, a genasi can usually pass for human. Those of earth or water descent tend to be heavier, while those of air or fire tend to be lighter. A given genasi might have some features reminiscent of the mortal parent (pointed ears from an elf, a stockier frame and thick hair from a dwarf, small hands and feet from a halfling, exceedingly large eyes from a gnome, and so on).
Genasi almost never have contact with their elemental parents. Genies seldom have interest in their mortal offspring, seeing them as accidents. Many feel nothing for their genasi children at all.
Some genasi live as outcasts, driven into exile for their unsettling appearance and strange magic, or assuming leadership of savage humanoids and weird cults in untamed lands. Others gain positions of great influence, especially where elemental beings are revered. A few genasi leave the Material Plane to find refuge in the households of their genie parents.