What is the name of the Asgardian gatekeeper in the Thor films?

Heimdall is the Asgardian gatekeeper in the Thor films. Portrayed by Idris Elba, he guards the Bifröst, the rainbow bridge that connects Asgard with other realms. His role is to monitor passage across the bridge and protect Asgard from threats.

Heimdall is described as having extraordinary sight and hearing, allowing him to perceive events across enormous distances. In Thor (2011), he recognizes the danger posed by Loki's plans and must decide whether to permit Thor's allies to travel to Earth. His loyalty to Asgard and his judgment make him more than a simple doorkeeper.

Heimdall appears throughout the MCU, including Thor, Thor: The Dark World, Avengers: Age of Ultron, Thor: Ragnarok, Avengers: Infinity War, and a post-credits appearance in Thor: Love and Thunder. Sif and the Warriors Three are fellow Asgardians, but they are warriors rather than the Bifröst's gatekeeper. The character is based on the Norse god Heimdall, who is also associated with vigilance and the bridge Bifröst.