In the game of Spiral Knights, Gremlins are a faction of enemies responsible for building all constructs/machines that you have to fight, and were once charged with protecting the Clockworks from invaders. Unfortunately, that's really all the game lets you in on; how their civilization works is vague at best, and while there are some named NPCs or bosses, you don't get to learn much about them or their backstory.
SO, as with most everything in my novel so far, I've gone and made their lore much more expansive and interesting as I could. Gremlins are rat-dog looking fellas with a knack for technology, and some can go a little mad if they're prevented from exercising their mind or creativity. They prefer to use tools over outright weapons to fight with, and while they excel in lowlight conditions, their sensitive vision makes it difficult for most to survive on the surface of Cradle, their homeworld(?). Most Gremlins reside in The Great Colony, hidden within the Clockworks, and three major clans are tasked with protecting the three 'tiers' of the Clockworks: The Tenderfoot, Ironclaw, and Darkfang Clans.
As for their leaders, The Nine, they are what the most elite Gremlins are referred to as in the game; a council of Gremlins that are masters of different trades: designing and building just about anything, combat and waging warfare, assassination and stealth, culture or recordkeeping, etc. Players only see 2 of these council members in the game, and there are but whispers of a King who may or may not even exist, but for the sake of my story, he resides on a throne hidden from everyone, including all Gremlins save for The Nine. What his goals are, what he wishes for-- well, that would be a spoiler.
https://tapas.io/series/Spiral-Knights-Project-R/info