I Was Summoned and Became a Guardian Spirit

Looking for Stories Where the Protagonist Is Someone Else’s Summoned Creature

An Ancient Guardian Spirit from a Billion Years in the Future

In an era where the older something is, the stronger it is, I come from ten billion years ago, yet everyone thinks I'm the lamest guardian spirit. They'd rather choose a dog that's lived for three years than me. But they don't know it's because I'm simply too ancient.

Novels About Guardian Spirits, with the Lead Starting at MAX Level

Guardian Spirit Novels Where the Protagonist Is Max Level from the Start

The kind where the protagonist is just ridiculously badass.

Any Novels About Summoning Guardian Spirits and Showing Off?

Any novels where the protagonist summons guardian spirits and shows off?

Looking for a Story Where the Male Lead Is Treated Like a Summoned Beast

Please, all you experts, help me out.

Any Stories Where the Male Lead Becomes a Summoned Beast? System

The more books I read, the higher my standards get.