Unidentified Jedi (stormtrooper's haunted psyche)

In 4 ABY, a stormtrooper saw a Jedi for a brief moment during a psychedelic battle in his haunted psyche as the mobile battle station Death Star II was destroyed with him in it.

In the hallucination, the Jedi appeared as a tan-skinned human with black—and for a brief moment, red—eye irises. The individual, who wore a Jedi robe, screwed up their face and put their left arm out as the stormtrooper's thoughts drifted away from the Jedi.

Text and facts from the “Unidentified Jedi (stormtrooper's haunted psyche)” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.