Ado is a young painter who appears in Kirby's Dream Land 3, as the boss of Cloudy Park. To attack he paints enemies that go after Kirby. These paintings are simply weaker versions of bosses from Kirby's Dream Land 2! They appear in the following order: Ice Dragon, Sweet Stuff, Mr. Shine & Mr. Bright, and Kracko. For the majority of the battle against Ado, he's standing safely behind his cloudy canvas, never trying to attack Kirby directly. If you defeat the boss that he has painted, Ado will get mad and create another. But, once you've gone through and defeated all of the bosses, he steps down to fight you himself! Now, Ado is actually very weak on his own. It only takes one quick hit to finish him off.
After you collect all of the Heart Stars for Cloudy Park, Ado will no longer be corrupted and instead will become a friend. Then, whenever Kirby stops by in his arena, he'll paint him a small little helpful item.
Adeleine is also a young painter who appears as Kirby's friend in Kirby 64: The Crystal Shards. She has very similar attacks to Ado, and at one time they even paint the same enemy! They also look very similar, carrying a paint brush and a palette and both wearing a smock and a barret.
It should also be known that Ado's gender was never really confirmed. It was assumed that Adeleine's counterpart would be a boy, simply because she's a girl.