Board Thread:General Discussion/@comment-26006155-20190131130037/@comment-32182236-20190201134905

The Unknown Reflection probably existed at a point in time when Frisk and Chara were meant to be the same entity. As you can see, it looks like a Chara, but with two stripes like Frisk.

Or, perhaps it was indeed meant as a reminder that Chara has partial control. Take a look at the Soulless Pacifist Ending again, but this time, stay with Toriel. Take a very careful look at the "Chara" sprite. It appears to be sort of a fusion of Frisk and Chara's sprite (with Chara having the biggest influence, though.)

Chara describes themselves as the feeling you get when a number increases. Bit those feelings.. They're a part of us, are they not? Are they suggesting they've been a part of us.. All this time?

That'd certainly eplain the reflection.

Also, Ferret, you left the post number in your Round 2 link. It's supposed to be: https://undertale.fandom.com/wiki/Thread:154596