According to the Lore the Drifter maybe suffering schizophrenic episodes or perhaps PTSD. It seems that he has seem something traumatizing...
*Edit* He is also hungry, he always seems hungry, that is a symptom to anxiety...
[spoiler]This is intriguing, I started to notice his rambling immediately when he was moved to the Annex...[/spoiler]
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Pretty sure he was talking to his ghost. In the new lore, they explain in great detail that his ghost is [i]really[/i] good at hiding. “Being hungry” also seems like an inside joke between the two, since Shin died of starvation multiple times as a young risen.
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That’s true, but he seems more neurotic now. More then ever...
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He probably has some screws lose...
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That sounds right, from what it says in the new Lore it says that the Drifter himself can summon the Taken (or something similar) on whim.... This close connection maybe a stresser and could be harming his mental stability...