The following is the list of who can breed with who. 

Humans: Dwarves, Elves, Orisiri, and Tieflings
Elves: Orisiri, Tieflings, and Starfallen
Dwarves: Humans and Orisiri
Tieflings: Elves, Humams, and Starfallen
Starfallen: Elves and Tieflings
Orisiri: Humans, Elves, and Dwarves

[@BingTheWing]