Page 132: Scoundrel: Spy: "Required Background In order to take this approach you must have a Human origin and be of the Houses of Nobility. You gain proficiency in the Deception skill."
So there are quite some restrictions on who can be a Spy in Symbaroum. However, I don't see this with other classes and approaches.
Wrathguard: Lore-wise it feels like Wrathguards should be barbarians exclusively, or perhaps also including changelings. But no restrictions are put on the approach. Can a goblin be a wrathguard? A dwarf? An Ambrian?
Templar: The same question is present here; can a troll be a templar? An elf?
In general I think all of the approaches need to be looked at in this regard.