But Who Are The Stalkers?

[Truly]

Epsilon
Turns its victims into goo.
The Strange Picross depicts Orin, and has the caption, "I know who Epsilon is."
Also, Orin confessed to being Epsilon.
Orin took it on, wanting revenge on Shilamora, but cannot kill her -- my hunch is it's because she's already goo.

Found in (1) Salvage Keep; (1a) Basement, in the =Note to Fikl= Frinotte the Girafarig (shopkeeper) expresses to Fikl the Snover her suspicion of Orin.
In our Interview of Fikl, he says what we already know: Orin doesn't like Shilamora, but is otherwise not cruel.

In our Investigation of Orin, we learn that he does little of note on a day-to-day basis (which, to be fair, he's very old.) He is an apathetic loner with few friends.
There, we also find =Orin's Diary Extract=