A closer look at nu!Link's little pal, upon request!
The top pics are my original attempts to conceptualize her, and the others were some practice doodles where I tried to get a better feel of how she's built. I found pictures of weasels and ferrets online and copied them, haha. She's still a bit fudgy, but I think I'm getting closer to something solid.
Her name is Bonsu. She's a member of a squirrelly-weaselly species of critters I'm tentatively calling 'sobarisu', or some variant, that lives in the forests near Link's homestead. They're an arboreal species that live in the treetops, though they often forage on the forest floor. Their diet consists of fruits, tender buds and shoots, seeds, and occasionally a bug or small vertebrate. Nuts are usually too hard for them, but they enjoy them if a helpful human cracks the shells for them. They only live in certain regions of Hyrule, though I haven't decided specifically where, since... I still haven't decided what region Link lives in, lawl.
They nest in tunnels, hollow trunks, and leaf nests. They're springy and energetic and super flexible, able to fold up on themselves and twist over 180 degrees, which helps a lot with moving through slinky tunnels and twining along vines and branches (and spatting with each other).
Link rescued Bonsu when she was a tiny baby, all fuzzy and wriggly but still blind and all alone. His parents weren't sure that he'd be able to save her, but he worked around the clock to keep her fed and warm, and she grew very quickly. She's fully grown now and never leaves his side. Barring some extreme circumstances, wherever one is, the other is always nearby.
While she's fully bonded to Link and trusts him unconditionally, she's a lot more leery with other people. Link's parents can pet her and (sometimes) pick her up, but anyone else is entirely on her terms, and she often looks to Link for signs of whether someone is safe. Fortunately, most folks are nice enough to earn themselves a curious little sniff.