@Misty - The Bubbles
As its name suggests, Bubbles (バブル, Baburu) is a mass of soap bubbles. It was created specifically to wash Cerberus. It was also used to wash dishes, and other things.
On its main body, Bubbles appears as a young mermaid-like little girl wearing a blue gem necklace along with some pearls tied around her bubbly head and turns her blue tail into her blue legs. She is under Watery.
@gromit - The Wood
The Wood is a gentle spirit that is able to create trees, branches, and vines. Sakura often uses Wood to form cages with which to trap other Clow Cards. Although gentle in nature, Wood sometimes becomes "overexcited" when exposed to water cards like Rain.
It is revealed in the Season 2 Finale that Wood is one of the cards under Yue's jurisdiction.
@greenfairy - The Big
The Big (ビッグ, Biggu) card has the power to enlarge any creature or object in size.
Big is a generally harmless and benign card, and it was content when Sakura appears to seal it away, willingly allowing her to do so with no protest or hostility. Although relatively gentle, when freed Big is not inconspicuous or discriminate with what it enlarges and this can lead to problems.
Big is aligned under the Light card, as is her sister card the Little.