Flower

Flowers appear in  and Kingdom Hearts: Chain of Memories, taking residence within the Lotus Forest in Wonderland. They are giant, talking plants who reward people for using items, such as Potions or Ethers, on them. All flowers, except the one that can enlarge people, can only take and give once, after which they merely chat with Sora.

Kingdom Hearts
Several flowers appear in Lotus Forest and all ask Sora for either a Potion or Ether. While most reward Sora through items such as Hi-Potions, one flower rewards Sora by enlarging him, similar to the effect of drinking the potion in the Bizarre Room. Sora's enlargement allows him to progress further through Wonderland and obtain the Claw Marks evidence, which is needed to help prove Alice's innocence at her trial.

Later on, after Alice goes missing at her trial, a flower is seen opening its petals and then shooting a boulder out onto the ground nearby, at which the Cheshire Cat appears on top of it.

Kingdom Hearts: Chain of Memories
Flowers reappear within the version of Wonderland crafted by Sora's memories. They can be seen in the background during cutscenes and are props in the field. Although they no longer trade items, Sora attacks them so that they open out their petals and potentially drop health orbs or Moogle Points.

Appearance
Flowers are, true to their name, giant flowers with thick, green shoots and leaves. Some flowers have red petals while others have yellow petals. Usually, their petals are closed into a bud however they bloom when they are given their desired item.

Personality
Not much is known about the flowers as they play a small role in the game however it is known that they are often grateful to those who satisfy them. The flowers are all part of the same community and they make friendships between each other. They are shown to have a certain level of thinking and intelligence as they frequently make remarks and observations about the world around them. Also, they are extremely mysterious, for example, one flower has a strange "power" to enlarge people.

Origin
Flowers originate from Disney's in which they have little significance. similar to the game. In the limited screentime they have, the flowers reprise their role of being talking flowers.