Feel free to create a goblin shaman or similar if you want their religion to be part of the story. Other than that, not many ranks are specified, so feel free to create team captains, guards ...

As a top-tier Commander combo-enabler for Gobbies, Grumgully is second to none, and it helps that this Goblin Shaman is equally as comfortable leading the charge as your commander as he is nestled ...

Conducting a series of increasingly sick rituals - involving the ashes of a gnome and silkworms fed fat on the corpse of a dwarven cleric - the goblin shaman Kirruk Redrats created this deadly bow.