Who are the threshold guardians in Toy Story 3?

In "Toy Story 3," the threshold guardians are characters that test the main characters' resolve and commitment to their journey. Key threshold guardians include Lotso, the seemingly friendly but ultimately manipulative teddy bear, and the other toys at Sunnyside Daycare, who initially seem welcoming but later reveal their darker intentions. These guardians create obstacles that challenge Woody, Buzz, and the gang as they navigate their new environment and fight for their survival. Their presence heightens the stakes and forces the toys to confront their fears and loyalty to one another.