Quote Originally Posted by EusisLandale View Post
Otis is noted to be an odd case in story, given that he was basically the first test subject for the process. Robot-Otis is clearly Otis's Soul+Memory Aethers, so (Proto?)Endless-Otis can safely be assumed to be a copy of Otis's Memory Aether data pushed into some blank Aether rather than the original after being essentially surgically separated like later Endless.

As for Erenville and his mother, he's just being hopeful even though the whole process of making an Endless involves an accelerated version of the natural process of things where the Soul Aether is reborn while the Memory Aether is lost, outside of deeply traumatic events that end up "scarring" the Soul Aether like witnessing an apocalypse.
Another notable detail about Otis is he seems to clearly remember the bad memories. Seeing the actress playing Sphene "dead" triggered what seemed to be PTSD and a flashback to that memory. This is a trait other endless don't seem to share as the system intentionally sets them up to live their happiest memories and seemingly deletes the bad to set up those situations.