Dumbo

Dumbo is a Summon character used by Sora in combat in Kingdom Hearts originally from the Disney movie of the same name. He is summonable using the Watergleam Gem.

Dumbo is a baby elephant with huge ears that allow him to fly. Apparently being the sole survivor of the destruction of his world, like several other summon characters (e.g. Bambi), Dumbo's spirit was sealed inside the Watergleam stone that Sora discovered while trapped in Monstro. Upon giving it to the Fairy Godmother in Traverse Town, Sora learns how to summon Dumbo.

When summoned, Dumbo hovers in midair with Sora riding on his back. The two are invulnerable to harm until Dumbo is dismissed or runs out of magic. Dumbo blasts a jet of water from his trunk at the enemies, drenching them, pushing them backwards or defeating them. Dumbo can also ascend and descend in flight. Dumbo is a useful Summon and is best used when surrounded by Heartless. Dumbo's world has yet to be shown in the any game so far.

When Sora summons Dumbo in Neverland, Dumbo is able to fly freely in the air instead of floating around.

In Kingdom Hearts: Chain of Memories Dumbo is another character who is recreated from Sora's memories, you can obtain the card to summon Dumbo after you complete the Monstro world.

Kingdom Hearts
''A baby circus elephant. He was taunted because of his huge ears, but his talent for flying made him the star of the circus. Ascend with O button, descend with [square] button. Attack: Splash. Cost: 3 MP. He first flew onto the screen in "Dumbo" (1941).''

Kingdom Hearts: Chain of Memories
A small elephant born in a circus. The other animals laughed at his big ears, but the courage to fly made Dumbo the star of the circus. If Sora calls, Dumbo will come to the rescue.