No. In the official Harry Potter series, Harry Potter is the main character who opposes Voldemort (not 'lusifer' which seems to be a misspelling of Lucifer). The story is about Harry's journey to defeat the dark forces led by Voldemort, not related to a fan - made theory like this at all.
It could be just a completely random and baseless idea created by someone who doesn't really understand the Harry Potter series. Maybe it was a joke that got out of hand, or someone trying to be edgy and create a controversial statement.
One of the common features is the use of bright and vivid colors to make the scene look lively. The dogs' body postures while swimming are usually emphasized, and there could be other animals or people enjoying the water along with the dogs.
The 'miu iruma hentai comic' is probably in a category that's not suitable for most audiences. Such comics often contain elements that are against social norms and values.
Rich baby cartoon is known for its charming visuals and engaging storylines. It might have elements like magical powers or cute animals to attract kids. The colors are usually vivid and the characters have big eyes and sweet smiles.
In the cartoon, the cat could be doing a cute and comical ballet dance. Maybe it's trying to imitate a professional ballerina but with its own funny twists and turns.