Goombario

From Mariopedia

Goombario is the first partner you will meet in Paper Mario.Goombario is a Goomba who lives in Goomba Town with his family.He is a Goomba with a blue cap and less sharper teeth than most Goombas.When Mario gets to Goomba Town,he explains to Goombario that he is on an adventure and he decides to join Mario.Goombario is able to tell Mario about certain enemies/allies/people.Sometimes Goombario states his own opinion about people and allies.It is shown that he has a friendly rivalry with Kooper.