So I know that their bodies are strictly mechanical, but in my own fan made stories that my friend and I have made for our guardians we’ve written multiple scenes where they’re in a a restaurant, a bar, or most commonly a Spicy Ramen shop. Only one issue: All six of our guardians are exos. Can these scenes even plausibly happen? I know that according to official lore and cutscenes, cayde liked to eat spicy ramen and would frequently head to bars, but I’m kinda fuzzy on whether or not he actually ate or if it just… splattered on the counter? I’m confused.
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Bungie is somewhat vague on the matter, though obviously the Spicy Ramen shop lore is typically what most people refer to regarding sustenance for Exos. I would also like to point to the toothbrush item given to Guardians during the Festival of the Lost 2019, if I am recalling that year correctly. Not to mention the Exo Stranger does have a toilet in her Yurt on Europa, which is suggestive of that particular bodily function. Personally, I believe it functions similar to humans in providing energy, in sort of a "bioreactor" as either the backup energy source or their main method of power, which would make more sense than needing to recharge or replace a main energy source after a certain period of time.