What does the average person know about Tieflings / Aasimar?

[Insain Dragoon]

How much would be normal for random townspeople to know?

Is the knowledge skill used Knowledge Local or Knowledge Plains?

Since they have no racial hit die what would the DC be?

I know basic Skeletons and Zombies have some exceptions to the knowledge rules due to how widespread education on the basic undead is. Is there any similar exceptions for PC races?

Do you allow NPCs to know standard racial features like their base energy resistances?

How much do basic NPCs know about the other potential player character races? Would they know a Half Orc could fight longer and harder? That Tengu could use any sword? That an Ifrit can SLA to enlarge a person?

[Myrryr]

For general PC races, DC 10 Kn local, though for outsiders it's still DC 10 Kn planes (tieflings, aasimar, undine, suli, ifrit, oread, sylph). This DC can drop in certain places where they're more common, like in Cheliax it'd be a DC 0 to know what a tiefling is for example, or could be higher in some places, like trying to know what a Nagaji is when you're not from Tian Xia.

So basically take location into it more than anything else.