[Flere821]

Originally Posted by Chibikiwi

Yeah me too.
Was the observer the one who pulled on Kirito's hair to make him notice that person watching them? Who is that person who was watching them? If I recall correctly didn't that person also appear when Alice broke the Taboo Index?

Spoiler for Observer:

The observer was a spider familiar named Charlotte, made by Cardinal. It ended up going the path of Yui, a limited AI gaining what might be called a fully-fledged soul/mind and went beyond its programmed parameters. After Charlotte was released from its duties after Kirito and Eugeo made it to Cardinal, she kept going with Kirito despite no orders to do so. When Administrator was about to kill Alice, Eugeo and Kirito she sacrificed herself in a "You Shall Not Pass" moment, buying time for Eugeo to summon Cardinal.

And no, the observer didn't show up when Alice broke the Taboo Index and lost her right eye.