I always considered his hologram portrait a more accurate representation of his personality; unhinged, ragged and desperate. His actions always came across as a wired man on the edge:
"I'll scour Hoover Dam with the Cloud, rain its walls with spears from the sun - with an army of Old World ghosts behind me, Holograms all. I'll kill them until it's only me, me alone in a quiet world."
https://fallout.fandom.com/wiki/Elijah
His ingame face just looked like a kindly grandfather who had a sly secret.
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"I'll scour Hoover Dam with the Cloud, rain its walls with spears from the sun - with an army of Old World ghosts behind me, Holograms all. I'll kill them until it's only me, me alone in a quiet world."
https://fallout.fandom.com/wiki/Elijah
His ingame face just looked like a kindly grandfather who had a sly secret.
Capital Wasteland Brotherhood Outfits at Fallout 4 Nexus - Mods and community (nexusmods.com)