Mistrusted. Due to their heritage, there are many who do not trust Tieflings, you have the Outsider minor hindrance, meaning you are likely to have a -2 penalty to Persuade in many areas.
Environmental Resistance. You have a natural +4 bonus to resist the effects of heat and hot environments, this also causes you to take 4 less damage from fire.
Asmodea (Lust)
Asmodean tieflings are very humanlike, but with exotic skin, hair and eye colors. The more monstrous of these can have multiple heads or eyes.