Missing townie taking up a "want"

My sim wants to complete an action with a townie named Seth. I cannot find Seth anywhere. He is not in my relationship tab, not available to call or invite over. He's not in the Manage Households menu, even the "not in world" ones. I cannot summon him with cheats since I do not know his last name. I have even googled townies and have not found him, so he must be a randomly generated one. I play on the Xbox. How can I find or locate Seth? He also just recently turned into a ghost in my want bubble, so I wonder if he was "culled" by the game? If so, how can I remove the want?