Board Thread:Questions and Answers/@comment-32218760-20170114020853/@comment-26133480-20170312012113

I agree on both Chara since she serves as the backbone of the entire story as well as (I believe) the narrator and the Bird given that indeed the DETERMINATION is second only to that of Frisk of all entities of any kind in the Underground as I see it.

Also, though: the Memoryheads.

They're the one form of amalgamates that we really don't know anything about; they don't even seem to be physical forms, but rather the fused memories that leaked out of the Minds of the determination-injected monsters(?) Alphys' memories that haunt her due to what she'd done(?) memories from Sans, since he might have been in part behind the DT Extractor(?) [the blueprints in his lab perhaps being what Alphys referred to?] some combination of the aforementioned(?)

The sheer mystery of them...