It wouldn't be right to have a Tom Bombadil hero without having a Goldberry hero, would it?
Goldberry has 8 threat cost, 3 , no or , and a moderate hit point pool of 4. She is overcosted by 1, but has inherent action advantage which we will discuss later. All in all, her stats are quite boring.
She has the Spirit trait, which does nothing. She also has the Healer trait, which helps with almost nothing, but enables her to use Athelas. This is not a terrible use for her, since she will usually be questing without exhausting. Her most important trait is Minstrel, which lets her sing Bilbo's Walking Song and Songs of Slumber. She pairs naturally with Tom Bombadil and Elena.
She is in , which allows for cards such as Let Us Sing Together and Silver Circlet. is very important to a Song deck, as many Songs and -rich cards are .
Her text box allows all Minstrel characters with a Song attachment to quest without exhausting. This allows characters like Elena to use their stats twice, or characters like Gléowine to trigger abilities. She also has a Response that lets you attached Song events to Minstrel characters as if they were Song attachments with blank text boxes. This is a great ability, as it enables her prior ability. This even happens naturally, since it is a Response to playing and resolving the event. An interesting combo would be the Elendilmir, which would allow her to do this twice per round and create a board of questing Minstrels. She also pairs naturally with her husband, allowing his to skyrocket.
All in all, Goldberry is the lynchpin of a Minstrel deck. Paired with Songs of Slaying, she can muster a bunch of on your allies who didn't exhaust to quest (and have a Song attachment!). She also provides access, which is essential to the Song archetype.