Ok, for best buddies, I've got Sherman. She's buds with everyone, which is very unlike that species. Usually other than a mating pair you can't put them with even others of their kind. But she's sooo social!
So, first her with her chickens. We've since had to give away the chicks, but when we had them they were always together, even sleeping in the same pen. The chickens refused to roost until we put a perch in Sherman's pen, and that's where they slept - right over her. I guess they thought she was their personal armored body guard.
Second, with Kitten. He loves everyone, including her. They hang together in the backyard. When I took her for a walk he insisted on joining us.