Do NPC's exist in God's world?

(For all of you noobs out there who don't know what an NPC is, see here.)
Either way, when it comes to the question of what the purpose of life is, people are quick to answer. 42, to serve God etc. Every Jew has a specific purpose in this world. Yeshivism often preaches that non Jews are here to serve us.I often wonder if there are NPC's in this world. People who's purpose here is only to be a tool to others. That's kind of what yeshivism claims all non Jews are...Perhaps more open yeshivists would be willing to admit that other non Jews help develop society and civilization. Or maybe they aide the yetzer harah (e.g. Steve Jobs). What about completely mentally disabled and unaware people? Are they only tools for others to do chesed? One can never know the answer... Any of your thoughts would be appreciated.