What does 'acceptence by riddle me think fanfiction' mean?

One way could be to understand the unique style and themes of 'riddle me think' fanfiction thoroughly. Then, create works that fit well into that framework.

Well, perhaps in this fanfiction, the author wants to break away from the traditional view of Harry. Instead of being part of the Potter family, he has some sort of connection to Riddle. It might be that the story explores a different side of Harry that is influenced by Riddle's character or story elements.

Think tank characters usually referred to characters with high IQ and wisdom in novels who could come up with unique opinions, make wise decisions, and have extraordinary thinking ability and knowledge reserves. The mastermind was often the main character or one of the key characters in the story. The image of a think tank character could reflect the author's emphasis on intelligence and wisdom, and it could also provide more imagination for the plot setting.

It might imply revisiting a conundrum or a tricky situation in the story that has the nature of a riddle. Say there was a character who left a cryptic message, and 'coming back to riddle in your story' would be to focus on that message again, perhaps to uncover its hidden meaning and how it affects the overall narrative.

The riddle of the doctor in Life is Beautiful was the different calls of a duck and a platypus, suggesting that Italian and German would eventually become the key to identifying the doctor. Through this riddle, the doctor sent a message to the protagonist, Guido. However, the movie did not reveal the answer to the riddle. The doctor hit the table in disappointment at the end of the movie, expressing his deep pain and helplessness. Therefore, the specific meaning of the riddle was still unknown.

Well, it could mean that the person is in a really bad or unpleasant situation within a fan - created fictional story. Maybe they don't like the plot, the characters are behaving in a way they dislike, or there are elements in the fanfiction that are making them uncomfortable.

This sentence came from a fable in Zhuangzi. It was about a bird that was praised by humans because of its gorgeous feathers. In the end, because of human praise, it pursued more gorgeous feathers and finally fell into the path of self-destruction. The meaning of this sentence was that if the decoration and magnificence of an object exceeded its actual value, people would misunderstand its value. In this story, the bird that pursued gorgeous feathers lost its intrinsic value because of its excessive pursuit of gorgeous appearance, and finally fell into a predicament that could not be extricated. Therefore, this sentence can also be extended to the fact that if we overly emphasize the surface decoration and appearance value of things, we will ignore the true value of their intrinsic value. Such excessive pursuit will only bring unnecessary waste and loss.

I'm not sure exactly. Maybe it's someone expressing an opinion that they think you have something to do with manhwa (Korean comics) of the GL (Girls' Love) genre.

Well, 'not me a novel' is rather an odd phrase. It might be a shorthand way of saying that a certain story or narrative isn't about the speaker. For example, if people are discussing various novels and someone says 'not me a novel', they could be indicating that their own life or experiences are not like what is described in the novels being talked about.

It probably means someone made a caricature or exaggerated representation of you.