Purrow is a skilled thief. He stole a potion recipe from a local wizard, and drinking it grants him amazing agility. Purrow and his sister Meesha attempted a theft at the annual chocolate ball, in the dead of night. Their hideout is thought to be in the Neopia Central sewers and together they are known as the Aisha Thieves.
I mean... how many possible combinations could there be?
It is unclear what relationship he has with the Thieves Guild. He holds a membership pendant, but the Thieves Guild Neopedia entry seems to imply he is not a member.