This is often a hot topic as people are rather passionate and dedicated to this race. Some rather Nerdy types can even be found takling in drow
"The personality of the Drow is a product of both nature and nurture. Since the Drow were banished to the Underdark and embarked on a fiercely and lethally competitive life style thousands of years and countless generations of Drow have passed. Those Drow who were most ruthless and aggressive survived to have children, and to pass on these traits.
The vicious nature of the Drow is partly a result of this selective breeding. The vast majority of Drow no longer have the capacity to empathise with other people, and are totally unable to form what surfacers would call a conscience. They truly do not care about anyone but themselves. Their brains are physically different; they have not inherited the brain paths and patterns that allow this to happen. Those few children who are born with this ability rarely survive to adulthood, and if they reach adulthood they almost always face being sacrificed on the bloodstained alters of Lolth or fleeing to live alone. Either way, they do not pass their abilities to a new generation.
The lethal competitiveness and utter lack of love or care in a Drow’s upbringing adds to this lack of empathy. Those who show signs of "weakness": - those who reject treachery and ruthless ambition, who show affection or caring for others, or who question the dogma of success at any price are rapidly weeded out. A Drow's entire childhood and adolescence is a training in treachery, and ambition. They are taught to feel pleasure in the pain of others.
Drow are supremely arrogant, highly ambitious and utterly ruthless. Almost all of them delight in inflicting pain and suffering for its own sake and also as a means to further their ambitions. Others find them detached and cold, or they are less fortunate and experience the strong sadistic streak in a Drow’s vicious heart.
Those few drow who have fled to the surface may have turned their back on the chaos and destructiveness of the Drow way of life. However they still remain Drow, with all the competitive drives and ambitions that entails. It is exceedingly rare to find any sign of altruism or conscience even within these Drow."
inbal jivvin rothen
OK Tieflings are a new things to me, as such if there is disagreement with what I post below PM or if your a DM, just edit it
"Wretched. Outcasts. Borne without a parent, borne into strange lands of the Lower Planes with nothing but themselves to rely on, the tieflings are part human and part something else. That 'something else' is rarely one thing: the bloodlines that they come from are almost undeniably tinted with fiendish blood. Horns. Goat feet. Tails. Six fingers. Three eyes. Random deformities. A tiefling can look like anything, as long as that "anything" isn't normal. While the aasimar are what most would consider the perfection of human form, the tieflings are the perversion of it. Mutants. Not one of them looks "normal", rather, they are each an individual, both mentally and physically.
The story that each tiefling could tell is sure to be one of mystery, intrigue, betrayal, and greed - and what makes it even more interesting is that it could all just be a lie. Tieflings lie frequently and lie when it suits them to do so. It is their fiendish nature peeking through, tapping them on the shoulders, not letting itself be forgotten. Anger, rage, greed, the 'deadly sins' are like old friends to the tieflings.
Not all tieflings want this. Most hate it, seeing their fiendish blood something that makes them scorned, untrusted, and hated by normal people. They desire to prove themselves, to show the world that they've risen above the stereotype that it's shown to them. They've survived on their own all their life, and they're not going to turn to other people for help. They're going to make a name for themselves in something, or they're going to die trying.
As much some might hate it, the tieflings usually fall in with the low-lifes. The gutter-trash, the thieves, the murderers. Maybe this is another stereotype created by the protective mothers "Come in right now, Jimmy! You know full well that four to antipeak is when the tieflings come out to gobble you up!" In reality, most tieflings aren't really so bad. Most have managed to rise (to some extent) past their beginnings into something else. It is true that throughout the rest of the planes, tieflings usually fall in with the fiends, serving them in one capacity or the other. "
