Board Thread:Off Topic/@comment-30530552-20180502010142/@comment-25396609-20180502033004

If I might interject, Heimdall chose that role for himself by competing against others for the job when Odin sent out the summons. He could have abandoned it at any time, but he held fast to his post.

Even in Thor: Ragnarok, with Odin fallen and Asgard basically fucked, no higher power enforcing him to keep doing it, he kept doing it. Because he chose to be a protetor of Asgard.