Marv

"Should've choosed a better-looking vessel"

- Metatron, talking about Marv

Marv is the vessel of Metatron. He seems to be from a distant time in human history, because he was friends with many Native Americans, and may have lived during the European colonization of the Americas.

All the angels know of Marv, or at least that this is what Metatron looks like as a human. Metatron seems to have bonded with his vessel like Castiel has, and he knows all his nature and thoughts.

Unlike many other angelic vessels, Marv has come out rather unscathed. He has only got a few scars from angelic blades, and he is actually one of the only vessels to still be alive as of season 9.