Characters who thought they were human, only to find out they're something else entirely
Son Goku (Dragon ball series)- Found out he is from the Saiyan Race
Ichigo Kurosaki (Bleach)- Not a typical human as his Father is a Full bloodes Soul Reaper and his Mother was a Full blooded Quincy
Hercules - Grew up a mortal human due to a potion but found he was the son of Zeus and Hera, making him a god/demigod