Human

The largest group in Ravnica, humans comprise the majority of the Gateless, those residents of the world who are unaffiliated with the ruling guilds. Their lack of innate preference for one type of magic over another means that humans can be found in every Guild— of course, that same variability means humans can barely agree on anything as a group. The constant flux of Ravnican migration and economic chaos ensures that humans from all across the city-world are in constant motion, settling and resettling as jobs open and close.

(A side note: Human is not the same thing as Caucasian. Please keep this in mind.)

Found in: Every guild, but particularly Azorius and Orzhov

Goblin

Unfortunately, the idiocy of goblins has become almost memetic in Ravnica; a rather unfair stereotype, given the sizable progresses their race has made for the world. Goblin technological innovation varies widely from the astonishing, to the intriguing, to the absurd. Their innovation can be attributed to their reckless disregard for danger and property damage, insatiable curiosity, and a focused, if skewed, outlook on life. These, when combined with an average goblin attention span (which is quite short) and an average goblin temper (which, if anything, is shorter,) make for entertaining and welcoming, if somewhat hazardous, communities. They tend to stand at half a human's height, with skin tinted gray or green.

Found in: Izzet, Boros, and Rakdos

Dryad

As beings born from trees, dryads have a natural affinity for green magic, as well as several unique perspectives on the domination of urban life in Ravnica. Their lifespans are significantly augmented, particularly compared to their human or elfin companions; dryads are capable of surviving for as long as their tree stands, and the death of one will result in the slow shriveling of the other. Despite their long life, there are relatively few dryads on Ravnica as they are quite slow to reproduce and the establishment of a new grove can take decades.

Found in: Selesnya

Elf

A race nearly as inclined towards the natural world as the dryads, elves gravitate towards the few remaining wild places in the cityscape of Ravnica. Distinguished by their sharply pointed ears, green eyes, and slender stature, elves take pride in their elegant appearance to the point of arrogance. Their talent with archery is legendary, and elven woodsmanship is second to none. Of course, other Ravnicans who interact with an elf might find their odd customs and tribal mentality anywhere from off-putting to downright charming.

Found in: Golgari, Selesnya, Simic, and Gruul

Angel

Angels are powerful beings of white magic; their origins are inscrutable, but their strength is undeniable. Angels are universally winged females, or at least appear to be so— it is unknown whether or not they reproduce like the other races, and some have theorized that they are born from white magic itself. Three varieties of angel have been observed: those of pure white magic, those which possess red power, and those which possess black power. Angels who can use red magic almost universally join Boros, the military guild, and are fiery-winged avengers with poor opinions of evildoers. Black and white angels usually join the Orzhov, where they become mighty, if remote enforcers of syndicate law. Angels of pure white are typically Gateless, but can be powerful defenders of the helpless Ravnicans caught in guild machinations.

Found in: Orzhov and Boros

Vedalken

Blue-skinned, hairless, and cerebral, the vedalken are famed throughout Ravnica for their methodical habits, perpetual calm, and rigorously rational worldview. Vedalken tend to live slightly longer than humans, at least on average, (they attribute it to the human habit of not thinking things through properly.) They are particularly desired for any research or analytical position in the guilds; their patience, forethought, and care are certain to yield reliable, if not particularly inventive, results.

Found in: Simic, Azorius, and Dimir

Ogre

Ogres in general are known for their strength, durability, and general disregard for such petty things as "laws" or "buildings." The average ogre is nine feet tall, bulky in ways few humans can match, and is generally confused by conventions of civilization they perceive as stupid, time-consuming or annoying (don't even get them started on zoning regulations.) They and the Azorius hold each other in a perpetual state of mutual distaste because of this outlook, and conflicts between ogre communities and law enforcement officials are depressingly common and inevitably destructive on a startling scale.

Found in: Gruul, Rakdos

Vampire

A rather mysterious race, vampires in Ravnica come in many shapes, sizes, and motives. What they have in common, however is this: they are beings animated by black magic and must steal power and life from another living being to exist. Normally, this is done by drinking blood; however, there are some vampires among the Dimir who are capable of draining life energy directly from a victim. Vampires cannot stand sunlight— this leads to their skin going unnaturally pale, yet another mark that sets them apart from their fellow Ravnicans.

Found in: Dimir, Rakdos, Golgari

Merfolk

Quick-witted and intelligent, merfolk enjoy games of cleverness and chance perhaps more than any other race in Ravnica. Their amphibious nature gives them an edge over their fellows; merfolk communities tend to reside by the water's edge and completely ignore the boundaries of the shore so that the great city continues even under the sea. The typically have a talent for blue magic, but they also possess a certain incorrigibility that makes it very difficult to respect the boundaries of the law. Or personal possessions. Or persons in general...

Found in: Simic, Selesnya, Izzet