Planetouched
Planetouched is a general category of races that shows up in Dungeons & Dragons and Pathfinder. It is a general term for races who have mortal ancestors, but who are marked by the outer planes, often as a mutation expressing traits of an extra-planar ancestor.
In other words, someone whose ancestor heroically refused to allow dimensional barriers to stand in the way of humanity's endless quest to put their penises inside of non-humans. Or, conversely, a woman brave enough to face the dangers of angel/demon/elemental cock. Generally, the first-generation products of these sorts of things are a bit too powerful to fall into PC hands, so most of the races below are the result of watering around that extra-planar potency a bit through a few generations of interbreeding with mere mortals.
Sure, theoretically it can also manifest as a result of arcane pacts, exposure to planar energies in-utero, wizardly meddling, blessings/curses (particularly by planar beings) and all other sorts of non-sexual stuff. But, as with sorcerer bloodlines, everyone's imagination immediately jumps straight to the porn.
Planetouched have always been popular choices for PCs since their introduction. There's the Mary Sue factor, sure, but there's honestly plenty of potential there for interesting concepts. And, as the editions go on and more and more people recognize Level Adjustment as the swollen inoperable cancer it was, playing one has only gotten easier and more-attractive.
The Planetouched have the rare distinction of being one of the few "legitimate monstergirls" of Dungeons & Dragons. Created as playable races by default, their lore also gives them a "unusual, but not hideously so" humanoid form. So, portraying a planetouched female as an exotic, alien beauty is perfectly compliant with their actual game lore.
Despite crossbreeding with humans just as much (if not more) nobody has yet made an equivalent for Half-Dragon descendants. The closest so far have been the Draconic creature template (which fits the spirit on a technical level, but is too much mechanically focused on being a watered-down half-dragon to count) and the Spellscale, which is just badly designed as a whole.
Aasimar
The opposite-aligned counterpart to tieflings, aasimar trace their lineage to the Upper Planes and its resident celestials.
There are far fewer aasimar/demihuman crosses, with the only named example being the Celadrin (elf/eladrin) of Dragon Magazine #350. However, Pathfinder still gave them a lot of varieties from different kinds of celestial ancestor.
For more details, see their page: Aasimar.
Aphorite
The Golarion equivalent of D&D's Axani and Zenythri, Aphorites are the Order Planetouched, created artificially by the Axiomites of Axis to serve as diplomats, envoys and, frankly, translators to the mortal cultures of the universe.
Axani
Hailing from Dragon Magazine #297, the axani are the inevitable "Axiomatic Planetouched", to contrast the Upper, Lower and Elemental Planetouched we already got. They're associated with all the Lawful Neutral planars, and to a lesser extent the ultra-lawful Upper and Lower Planes. They look very well-formed, always having symmetrical features, and may occasionally have a metallic tint to their skin and/or hair. They're extremely organized, disciplined and regimented, as you'd expect of someone with pure Law in their bloodline. They've also never been nearly as popular as the first three, possibly because the axiomatic outsiders are purely a construct of the RPG writers with little basis in real-world mythology to prick the imagination, possibly because outside of the robots Law outsiders have always been pretty damn boring.
They're Medium sized normal-speeded Native Outsiders with +2 to both Int and Wis (though their ability fluff states that they are "logical and calculating, but tend to be cold and emotionless", implying they were supposed to get a Wis or Cha penalty), Cold & Sonic Resistance 5, a spell-like ability (Calm Emotions 1/day as a Cleric of their character level), +2 racial bonus to Diplomacy and Spot, and Darkvision 60 feet. Their favored class is Monk (what did you expect?) and they get a Level Adjustment of +1, like all the other Planetouched from 3.5.
Cansin
The axani's counterparts, the cansin are the spawn of pure chaos, serving the role of "Anarchic Planetouched," right down to never being as popular or well-supported. The purely chaotic outsiders, again, have never been the most interesting, and in fact have tended more towards "lol! Random!" Chaotic Stupid behavior and antics.
Cansin look like humans but always have some strange trait that emphasizes their anarchic nature. Some examples include eyes that randomly change color (and not in synch with each other), irregular features, and an "aura of randomness". They always seem disheveled and disorganized, no matter how hard they try. Statwise, they're Medium sized normal speed Native Outsiders with +2 Int and +2 Cha (though, again, they have fluff implying that should be a charisma penalty), Acid & Fire Resist 5, Entropic Shield (caster level = character level) 1/day as a spell-like ability, +2 to Bluff and Search checks, Darkvision 60 feet, favored class of Sorcerer and Level Adjustment +1. Pathfinder's analogue to the cansin are the ganzi.
Chaond
Coming from the Monster Manual II in 3.0, the chaond are demonstrably tied to Slaadi rather than any generically chaotic outsider. Not usually the result of mating with a slaad, simply because slaadi "mate" by laying their eggs inside of other creatures with all the romance of a bot fly so their larvae can eat their way out. They have stocky builds, long limbs and blocky facial features, as well as colors that constantly shift at random.
Like their Zenythri counterparts, they only have NPC stat blocks rather than proper PC stat blocks, so their stats need to be reverse-engineered to make them playable. Chaonds are Medium sized Outsiders who have Resistance 5 against Acid, Cold and Sonic, receive a +2 bonus to Escape Artist and Tumble checks, and can cast Shatter 1/day with a caster level equal to their character level. With a Level Adjustment of +1, they treat their very first class as their Favored Class - so a Chaond who starts her career as a Fighter has Favored Class (Fighter), whilst her sister who took the path of the Warlock has Favored Class (Warlock).
Duskwalker
Duskwalkers are a unique Planetouched race hailing from the Boneyard, the Golarion equivalent of the Shadowfell. They are former mortal souls reincarnated by the psychopomps, usually as a result of having died before their time, giving them an innate affinity for death.
Fetchling
Fetchlings are the descendants of humans who were stranded in the Plane of Shadow for a prolonged period of time, and are the Golarion equivalent to Shades.
Ganzi
Mortals mutated by exposure to the pure chaos energies of the Maelstrom, the Ganzi are effectively the Golarion equivalent of Cansin.
Genasi
Seeing the pattern here yet? These are your basic Elemental Planetouched, with powers relating to earth, air, water or fire. This might be the result of actually boning a creature made of primordial fire (no mean feat!), or of boning the properly-aligned elemental genie.
For subraces, we got two demihuman-specific crosses (the Dwarf/Azer hybrids called "Azerbloods", and the Halfing/Genie hybrids called "D'hin'ni", both from Dragon Magazine #350), and an assortment of alternate elemental affinities. Dragon Magazine #297 gives us Paraelemental Genasi (Dust, Ice, Magma, Ooze, Smoke and Steam), 4th edition made lightning & thunder-themed "Storm" Genasi part of the defaults and had Athasian Genasi of Sand, Ember, Sun and Magma and corrupted "Abyssal" Genasi of Caustic, Plague, Cinder and Void, whilst a Ravenloft fan-splat called Quoth the Raven #7 has Dread Genasi (Grave, Mist, Blood and Pyre).
Yet again, check their page out here: Genasi.
Pathfinder reworked the concept a lot, with four distinct races - Ifreet of Fire, Oread of Earth, Sylph of Air and Undine of Water - filling out the roles of "elemental Planetouched," plus the Suli, who originate from jann genies and have a bit of all four elements inside them.
Glimmerfolk
Hailing from Dragon Magzine #321, the glimmerfolk were a tie-in to that issue's newly introduced "optional" Plane of Radiance. They're described as being the descendants of humans who live in forests touched by the energies of the Plane of Radiance, giving them deeply tan skin, fair hair, jet-black eyes lit by flickering sparks of color in lieu of pupils, and their trademark nimlis; three 2 inch diameter orbs of colored light that constantly float around them. Their picture gives them elf-like ears and multicolored hair, but the text says nothing on this, and claims they only live as long as humans.
Unlike most of the planetouched here, glimmerfolk don't have the Native Outsider type, possibly because they were written under 3.0 rules. They get +2 Dex for -2 Strength, low-light vision, immunity to "pattern effects", +2 to Perform, +4 to saves vs. spells from the Shadow subschool or with the Darkness descriptor, -2 penalty to Hide checks due to their built-in torches, and the Nimlis spell-like ability. Essentially, as a standard action, a glimmerfolk can "use up" one or more nimlis to cast a certain spell, and once a nimli is used, it takes an 8 hour rest to recover them all. Spending 1 nimli lets a glimmerfolk cast dancing lights, daze or flare, 2 can be spent for color spray or magic missile, and burning up all three at once lets you cast mirror image.
Mechanatrix
No, not some sort of dominatrix warforged monstergirl. (Damn it!) These are planetouched who (somehow) display heritage connecting them to the mechanical outsiders of Mechanus -- the Modrons and the Inevitables. This is usually non-sexual, for obvious reasons (but not always, also for obvious reasons). Visually, mechantrices look like their humanoid ancestors, but always have at least one clearly mechanical or inorganic physical feature - razor-blade hair, clockwork eyes, pipes sticking out of veins, etc. Their skin is usually smooth and has a metallic sheen. They originated in the Fiend Folio.
Like the Chaonds, they were never supported as a fully playable race, so their stats must be reverse engineered for use as player characters. What's clear is that they're Medium sized Outsiders who can Shocking Grasp as if they were a Sorcerer of the same character level 1/day, they have the Electricity Healing trait (immune to Electric damage and instead heal 1 point of damage per 3 points of Electric damage taken), they get a +2 to Spot checks and a +4 to Knowledge (Architecture & Engineering) checks, their favored class is Fighter, and they have a Level Adjustment of +1.
Shyft
The ghost-like shyft, documented in the Fiend Folio, owe their lineage to the Ethereal Plane. There's not a lot else to say about them, since the Ethereal Plane has always been the most BORING of the planes, and they haven't really been updated since. Seriously, who can even name any of the outsiders native to the Ethereal, hmm?
The fact that their racial stats are set up in Monster Manual format, and absurdly overvalued, certainly doesn't encourage you to play them; at the cost of a +3 Level Adjustment, you get to be a Medium Outsider with low-light vision, Cold/Fire/Sonic Resistance 5, +4 to Hide & Move Silently, and Ethereal Jaunt 1/day (9th level or character level, whichever is higher).
Tieflings
The original and, in the eyes of many, the best Planetouched, tieflings started it all when they appeared way back in the Planescape Campaign setting. They are the descendants of mortals and fiends - the denizens of the Lower Planes, such as demons, devils and daemons.
The general tiefling is expected to be of human ancestry; demihuman tieflings consist of the Fey'ri (Elf) and Tannaruk (Orc) from Monsters of Faerun, the Maeluth (dwarf/devil) and whispling (halfling/demon) in the Fiend Folio, and the Worghest (goblin/barghest) from Dragon Magazine #350. Pathfinder actually stated out a number of different strains, originating from mortals with one predominant kind of fiendish ancestor.
For more details, see their page: Tiefling.
In an interview, Mike Mearls has stated that the plan for Dungeons & Dragons 5th Edition is to use "tiefling" specifically to refer to Baatorian planetouched (homaging the "tiefling is derived from (bad) German for devilspawn" thing), whilst "planetouched" takes the tiefling name's former role as "catch-all term for any mortal with heritage tainted by the Lower Planes"... what? Don't believe us? Here's what the man said himself:
- A tiefling describes a planetouched person who traces their ancestry to the Nine Hells. But planetouched describes in broader terms what in second edition would have been called a tiefling. So this idea that you could have someone whose ancestry is traced to a Yugoloth or a hag, that’s still part of the D&D universe, and tiefling has gone from being the name of that category to the name of a specific portion of that category, and planetouched describes the general thing of a humanoid who has fiendish ancestry of some sort.
Zenythri
Short version? Some other lawful outsider knocked up your grandma. These originated in the Monster Manual 2, and so in the eyes of some DMs, these are the "official" Axiomatic Planetouched, so they're slightly more likely to let you play one than they are to let you play an Axani or Mechanatrix. They look like impossibly perfect-featured humans; a zenythri's skin is flawlessly smooth, and its muscles are well defined and taut. Even its hair falls effortlessly into place around its handsomely chiseled face. The only real give-away (besides the looks; no human is that good-looking) is the fact their skin and hair always has a slight blue or purple tint.
Like the Chaond and Mechanatrix, they were never supported as a fully playable race and their stats must be reverse-engineered. They are Medium sized Outsiders, with Resistance 5 to Electricity/Fire/Sonic attacks, a True Strike 1/day spell-like ability (caster level equals character level), and a +2 racial bonus to Balance and Intuit Directions. Their favored class is Monk and they have a +1 Level Adjustment.