Mikitaka Hazekura

Mikitaka Hazekura, aka Nu Mikitakaze Nshi (ヌ・ミキタカゾ・ンシ) is a minor protagonist who appears in Part IV: Diamond is Unbreakable. Mikitaka's Earth Wind and Fire reference is most likely the song "Jupiter" by the same group. Mikitaka's last portion of his name (taka) means "Eagle" in Japanese, and an eagle is a common symbol to depict the planet Jupiter.

About
Josuke Higashikata and Okuyasu Nijimura discover Mikitaka unconscious in the middle of a crop circle in a field while going to the ice cream shop.

Eventually, Josuke uses Mikitaka's ability to change his shape to cheat at a dice game against Rohan Kishibe to win money for the rest of the summer.

Whether Mikitaka is indeed an alien or if he's just deluded because of the arrow or his newly-acquired stand power is unknown.

Stand
See Earth, Wind, and Fire