Heimdall (Earth-8312)

"Be warned, I will honor my sworn oath to protect this realm as its gatekeeper."

- - Heimdall

Heimdall is the omniscient Asgardian who is the only one able to travel freely between the Nine Realms through the Bifrost, located on the far borders of Asgard, which he serves as a guardian. The protector of the Tesseract and a loyal ally to Odin and his family, Heimdall can rarely intervene in the events and battles he witness, as he cannot leave his position without endangering the lives of all his kind.