Huh... Seems like a few more than should be a coincidence. Heimdall's a guardian. Watches out for Jotuns...guards Bifrost. Has a horn for when there are Intruders. Think the myths say he doesn't sleep, and has ridiculous sight and hearing.

Has a nemesis among the Aesir. Loki. Blood brother to Odin, king of the gods, but a Jotun by birth. ....God family trees are weird. Anyway.... Heimdall and Loki slay one another at Ragnarok, the- the end of ev-- the end of days.

[Shhhh he's fine it's fine.]

Don't know all the details, didn't research him as much as some of the others.