If you're looking for anime similar to Raincoat Kids, you might like these titles.
Paul is a young boy whose friend Nina is kidnapped by Belt Satan, the demonic ruler of another world. He daringly goes on a mission to rescue his friend. Pakkun, a plush doll with magic powers, aids him as they plunge into Belt Satan's dimension of living toys. Paul's journey is beset by many difficulties, but he also encounters a variety of delightful wonders
This is a folk-tale-like adventure story of an active boy on a quest for the Water of Life. The boy sets out on this quest after learning that the Water of Life is needed to make his village happy. On the way, he meets gods, demons... Soon, he discovers that the evil snake has stolen the Water, and he heads for the snake`s palace. Defeating the snake is not easy since it has the Water of Life to revive itself. This boy - Maegami Tarou - continues his courageous quest in cooperation with various creatures and the gods.
Jack and his animal friends must fight a powerful witch that wants to transform living beings into slave harpies. Nearly brainwashed by one of her minions, he and his pals enter her castle to face the sorceress and her army of underlings.