Board Thread:Wiki Discussion/@comment-26843781-20160301110343/@comment-26814804-20160519181642

From what I can see so far, wether or not a character has white pupils depends entirely on the size of their eyes. Characters with larger eyes generally have white pupils, with the exeption of TORIEL and ASGORE. The eyes also might indicate DETERMINATION, or simply sheer power, as Undyne and ASRIEL's GOD form are the only sprites that have unusually white pupils (Undyne's pupils are normally black, and most Boss Monsters seem to have black pupils.)