Pathfinder Adventurer's Guild
This is the tier of non-heroic heroes and where most NPCs would be found. If you have skills above what most people can do untrained, you would be considered Tier 0.
If you’re planning on playing in a Tier 0 adventure you should be sure to focus on the unstatted qualities of your hero (such as personality, relationships, and personal history) and be prepared for a completely non-heroic setup.
Tier 0 characters are made using the general character creation rules, but are always level 1 and a commoner. If they survive the adventure, you are welcome to promote them to Tier 1 with all the abilities that come with that superseding their tier 0 stats.
Characters in this tier: Homer Simpson, Dudley Dursely, Beavis and Butthead