Tieflings

Tieflings share blood with demons, devils, oni, and other evil outsiders, but still share heritage with the Many Races. They are more inclined toward acts of evil rather than kindness, and they gravitate toward crime and cult-like organizations. Most societies interpret Tiefling births as bad omens, though it must be acknowledged that most Tieflings strongly reject their reputations, graciously subverting the expectations of others with acts of reassuring kindness or humble honesty. Being that the majority of Tieflings don’t

Most Tiefling bloodlines don’t show kin to a particular fiendish ancestor, but instead can be different for several generations in a row. Even twins can show signs of two different ancestors (such as Devil-blooded  and Oni-blooded). However, some Tiefling bloodlines have been intentionally created by fiends to push their own agendas on Negrotharl. These Tieflings are rarely able to breed and more closely resemble the fiend that created them. Also, they tend to have their souls immediately retrieved once their benefactor’s goal has been achieved.

Tiefling stats, traits, subraces, favored class options, alternate racial traits can be found here