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When it comes to Seth's skills, he has maximized the mechanical skill, is close to maximizing the creativity skill. He is the first created Sim in Veronaville, as his NID is 1. This is uncommon for an NPC.
Seth has 0 interest points in Sci-Fi which is relatively uncommon, given that almost all other NPCs, young adult and up have 4 points in Sci-Fi. However it is not uncommon for NPCs that were created before, or at the same time as the playable and deceased Sims. According to his SimDNA in SimPE, his hair was blond, before it turned grey.
Sometimes if Seth is made playable, his PlumbBob will be inside him, instead of above his head. This happens with several other repairmen in The Sims 2.