Board Thread:Wiki Discussion/@comment-26843781-20160301110343/@comment-27907368-20160519170606

Beings with white eyelights include: Undyne the Undying, Asriel's God-like forms, Flowey, Sans, Froggit and Final Froggit, Migosp and Migospel, Loox, Napstablook, and Jerry.

Beings that may have white eyelights, depending on how you see the face: Knight Knight, Vegetoid and Parsnik, Astigmatism.

I believe that's an exhaustive list. :D Here are a few pictures from the main cast (and Blooky, because I like Napstablook. <3). Two pictures of Flowey, the first from before he has the human SOULs, the second from after.

http://i.imgur.com/Dg4MeSm.png