So why did Ayu disappear? Is it the disappointment that Yuichi doesn't like her what resulted in the end of her dream, or is it Haruhi's godly power which unconsciously deleted Ayu from the world? ^^
Their resemblance is quite disturbing, not just for you, Ayu..
You can put the blame on KyoAni, as they refused the existing character design from Kanon 2002, but used one from SHnY instead (not to mention his voice actor too).