Pina

Pina is Silica's blue «Feathery Dragon» with its body covered in soft, pale blue feathers and two feathers instead of a tail. It is the first monster to be tamed in Sword Art Online. It understands Silica's commands and will protect her in any way it can, as it is her «Familiar». It is also present in ALO as her Cait Sith familiar.

The Black Swordsman (Aincrad 35th Floor, February 2024)
Pina became Silica's familiar after Silica fed Pina some peanuts she bought.

After Silica gets into an argument with her party members, she leaves them without even taking recovery items with her. She and Pina get lost in the forest, where at one point they are surrounded by monsters. Pina takes a deadly blow meant for Silica and perishes. Silica and her temporary companion Kirito, go to «The Hill of Memories» on the 47th floor to obtain the rare pet revival item «Flower of Pneuma». After they return to town with the flower, Silica uses it and successfully revives Pina.