Pina

Pina is Silica's blue feathery dragon with its body covered in soft, pale blue feathers with two feathers instead of a tail. Its species is «Feathery Dragon». 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 gets lost in a forest, where at one point they were surrounded by monsters. Pina takes deadly blow meant for Silica and it dies. Silica and her temporary companion Kirito goes to «The Hill of Memories» on the 47th floo and obtains the rare pet revival item «Flower of Pneuma ». After they return to town, Silica uses the item and successfully revives Pina.