Tori-San or ‘Mister Bird’ as he is called, while being attached firmly to Harlock’s side, is generally Tochirō’s pet (Tochirō, Captain Harlock's best mate, single-handedly constructed the Arcadia and most of the devices on it. He and Harlock form a lasting partnership in all their incarnations) although he did belong to both Tochirō and Harlock in Hunt for Young Harlock, and to Zoru's family in My Youth in Arcadia. He remains loyal to Harlock and Harlock has a soft and tender spot for this bird.
This is Medicom's 1/6 scale "Tori-San" that accompanies Space Pirate Captain Harlock from Galaxy Express 999 (see previous post). It has bendable neck and movable legs so that they can rotate and grip on Harlock's shoulders.
Pirates usually prefer parrots, even the dead ones like Pirate Jack (see my post here) from "James and the Giant Peach"