Kinpika

A name bestowed upon Gilgamesh by Rin.
Gil's “golden” reputation doesn't just come from the armor he wears when fully equipped for battle, but from the fact that even the color of his soul is gold.
Also, he's the richest character in the story.
Accordingly, his compatibility with the notorious wallet-drainer Rin is…

THE BEST.

…But let's keep that a secret between you and me, okay?

Fate/side material: Fate Encyclopedia