Original Squadron Yellow Ranger

This unidentified Yellow Ranger is a member of the Original Squadron Rangers whose powers in the form of the Legendary Ranger Key were used by Gia Moran - The Super MegaForce Yellow. As noted by Gosei, these teams had never been seen before on Earth, at least the Earth of the prime dimension, up to that point.

Origins
He along with fellow Rangers assisted the Mega Rangers against the Armada in the Legendary Battle. He passed his powers including the Yellow Thunder Gem to Keiko allowing her to succeed him as the Yellow Ranger.