Maybe not my absolute favorite, but my WoL uses the name Squirrel as a nod to an ancient forum handle. And one of the first minions I got back when I hadn't finished ARR was a nutkin drop from a PotD coffer. It was one of the first minions that would crawl up to sit on my shoulder, it fit my theme, and it was adorable and had a cute idle animation. Even if nowadays I cycle through favorite NPC minions like Ysayle, FSH related minions (It took close to 200 attempts to get that bucket so it's my companion during Legendary Fish grinds), and other cute animal minions like the Siamese cat and Silkie, the nutkin was the first.