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.

Creating a Genasi

Ability Score Increase. Your Constitution score increases by 2.
Age. Genasi mature at about the same rate as humans and reach adulthood in their late teens. They live somewhat longer than humans do, up to 120 years.
Size. Genasi are as varied as their mortal parents but are generally built like humans, standing anywhere from 5 feet to over 6 feet tall. Your size is Medium.
Speed. Your base walking speed is 30 feet.
Languages. You can speak, read, and write Common and Primordial. Primordial is a guttural language, filled with harsh syllables and hard consonants.

Source: Elemental Evil Player's Compendium

Racial Options

There are a few options to make your character fit the ideas you may have. The Ability Score Increase, Size, and even Languages can all be customized to better fit your character's history. Maybe you come from a very hardy people, like the Dwarves, but your character can't handle even the slightest cold breeze, but they make up for it with their incredible intellect. You could have been born of the tall and long Elves, but you find yourself barely coming up to some of their hips. Your Goblin may have been adopted by a couple of loving Genasi and they taught you to speak Primordial instead of Goblin. The options listed under your chosen race are just suggestions to easily fit your character within their culture's society, but you can change things up to make your character truly yours. There may be limitations set by the DM; rarely will you find a Large Fairy or a Tiny Goliath, but if you have a good story-driven reason for different character options, anything can be possible. Below are open-ended options for customizing your race.

Ability Score Increase. Increase one ability score by 2, and increase a different one by 1.
Size. Your size is within one size option of your race's average size.
Languages. You can speak, read, and write Common and one other language that you and your DM agree is appropriate for the character.

Choosing a Class

Artificer
Barbarian
Bard
Cleric
Druid
Fighter
Monk
Paladin
Ranger
Rogue
Sorcerer
Warlock
Wizard