I'm not sure which comic 'The Secret of Heartthrob' refers to because it's not a known comic name. If you can provide more information such as the subject matter of the comic, the author or other details, I will be able to better answer your questions.
The heart of manga could be in the unique plotlines that keep you engaged or the relatable characters you root for. It can be in the way the author tells the story and makes you feel part of it.
I recommend the book, Reborn Concubine, to you! This novel was a fantasy romance-Eastern fantasy. It told the story of a noble genius female protagonist who was killed by a scheme. After she was reborn, she controlled space, cultivated a hundred skills, refined a thousand pills, swore not to be human, and abused scum to level up. She told you what it meant to look down on all living beings and be awesome to the peak. I hope you like this fairy's recommendation. Muah ~😗
Yes, in fanfiction, Naruto can be given the ability to manipulate metal. Fanfic writers often like to give characters new and unique powers for the sake of creativity and exploring different storylines. It could add an interesting dynamic to his combat skills, allowing him to control metal weapons of his enemies or create his own metal constructs for offense or defense.
To manipulate words effectively in online stories, first, build a rich vocabulary. Then, focus on creating a rhythm and flow in your writing. Also, use literary devices like metaphors and similes to add depth and interest.