Should multiple parentheses ever be used in a novel?

The comma is usually placed outside the parentheses if the parenthetical content is not an integral part of the sentence. For example, 'I went to the store (after work) and bought some milk.'

It really depends on the style and flow of your writing. You don't want to overuse them or it can look messy.

It depends on the specific novel. Some might use italics, while others might use parentheses, or neither.

Not necessarily. Parentheses can be used effectively in novels to add supplementary or clarifying information without disrupting the main flow of the text.

Not typically. Fiction is more commonly presented without parentheses.

In many cases, it's fine. They can offer quick asides or supplementary information that enriches the narrative. Just make sure not to overuse them and keep the story's readability.

In a visual novel, when a character speaks in parentheses, it often represents their inner thoughts. It gives the player a peek into what the character is really thinking, which might be different from what they outwardly say. For example, a character could be smiling and saying kind words to another, but in parentheses, they might be thinking something sarcastic or devious. This adds depth to the character and makes the story more complex.

Sometimes. Quotes can be employed sparingly to support your arguments or give a flavor of the novel's language. However, they should serve a clear purpose and not just be included randomly.

For a novel, it's common to have margins of 1 inch on the top, bottom, left, and right. These margins provide enough white space for the text to breathe and make the reading experience more comfortable. Also, they help when formatting for printing or ebook conversion.

You often use italics for thoughts and internal monologues of characters. It helps distinguish them from the regular narrative.