This is an NPC, or a non-player character.
Buddy is the official mascot of Growtopia. Buddy can be seen on Growtopia's App logo, from iPad, iPhone, Android, PC, etc. He is also present in Hero Portrait - Buddy.
Trivia
- In Seth's AMA thread, he said that the reason Buddy wears Green Shirt, Jeans, Brown Shoes, and Red Hair is because they are part of the first clothes to be added in Growtopia on the day of its release date.
- Before the release of Hero Portrait - Buddy, he didn't have an official name and was recognized as the mascot only.
- The Mini Growtopian is a leash that looks and has the same clothes as Buddy but smaller.