A «Navigation Pixie» (小妖精,Nabigēshon Pikushī?, lit. "small fairy") is a pseudo-character program for user support in «ALfheim Online» (ALO). These pixies are usually used by players who pay additional fees in order to receive basic system information through synthesized voices. They can also scan areas for other players. Additionally, around the time of ALO's launch, a raffle was held to give away «Private Pixies» to those lucky enough to win.
Yui is categorized as a Navigation Pixie in «ALfheim Online» after being transferred from «Sword Art Online».