You can try looking on local Sinhala children's bookstores. They might have collections of such stories in cartoon form. Also, some libraries in Sinhala - speaking regions could be a good source.
The He-Man vehicles cartoon has cool designs and powerful functions. The vehicles often have unique abilities that help the heroes in their adventures.
Sinhala culture is based on strong family values, religious beliefs, and a sense of community. Sinhala erotic novels, if they exist in large numbers, could potentially undermine these values. They might introduce ideas that are not in line with the traditional moral code of the Sinhala people, causing a shift in the perception of appropriate behavior.
The plot you mentioned might have come from the cartoon One Piece. In this cartoon, there was a character called "Monchi D. Luffy". He was an adventurer who sailed with his companions on the sea in search of legendary treasures. During their journey, they had once visited an isolated island and met a character called " Dumbo."
Dumbo was a character with a unique personality. He looked a little silly but was actually very smart and like his companions, he was moving forward to realize his dreams. In this plot, Dumbo was persuaded by Luffy and the others to join their adventure and spend an unforgettable time on the island with them.
The complete Spider-Man cartoon series is as follows:
1 Spider-Man: Parallel Universe
Spider-Man: The Return of the Hero
Spider-Man: Black Panther
Spider-Man: Road of No Return
5 Spider-Man: Eternal Warrior
6 Spider-Man: Invincible Heroes
7 Spider-Man: Parallel Universe 2
Spider-Man: Iron Man 2
9 Spider-Man: Heroes Return 2
Spider-Man: Road of No Return 2
These cartoons were all classic Spider-Man works. Each episode had a different story and scene. It was very interesting.
Rope man diaper man cartoon often has a mix of strange visuals and maybe a storyline that's hard to predict. It could be aimed at a very specific audience with particular interests.