Aiko Nezu is a supporting character in Princession Orchestra who is known for being an extremely devoted admirer of Nagase Ichijo. She describes herself as Nagase's biggest fan and consistently demonstrates her commitment by wholeheartedly supporting her idol, going so far as to follow her by any means necessary. Her appearance in Alicepia features soft mauve hair styled into twin tails secured with dark purple ribbons, complemented by greyish-blue eyes. She wears a pale pink T-shirt with a dark purple skirt, accessorized by a heather mauve belt and mauve buckle shoes.

In terms of personality, Aiko is defined by her enthusiastic and persistent fandom. Her admiration for Nagase is the driving force behind her actions, and she looks up to her with great affection. This dedication leads her to actively seek out opportunities to be near Nagase, and on one occasion, she successfully meets up with her in Alicepia to spend time together.

Regarding her abilities, Aiko possesses a song fragment that allows Princess Meteor to summon glow sticks. These items are not merely for show, as they can be utilized as rockets for projectile attacks or wielded as tonfas for close-combat purposes. This power directly supports the combat capabilities of Princess Meteor, aligning with Aiko's role as a devoted follower. Her relationship with Nagase Ichijo is the most significant connection she has within the story, defined entirely by her role as a major fan who adores and supports her.