Poptropicans are the virtual equivalent of humans in Poptropica. Your avatar, and most NPCs you encounter are also Poptropicans.
Poptropicans have very similar anatomy to humans - legs, body, arms, and head. They differ, however, with large eyes that pop out of their skull and the lack of a nose. Their bodies are bean shaped.
Ingame, Poptropicans have a stylistic design.