Nathaniel has personality points and interests, something not every ancestral Sim has. He is completely resurrectable, even though he doesn't have a grave. Nathaniel has the Romanceaspiration, and the Arieszodiac sign. As far as personality, he is very outgoing, somewhat active, and a little bit neat. But he is very grouchy and serious.
According to Nathaniel's SimDNA in SimPE, his hair was red before it turned grey. According to his age data, he had 12 days left in the elderlife stage when he died. Nathaniel's facial structure is seemingly identical to the 18th Maxis face template in Create a Sim.