Goku and Grandpa Gohan's interaction could be full of wisdom - sharing. Grandpa Gohan was a wise man, and he would pass on more of his knowledge to Goku. Goku, in turn, would tell Grandpa Gohan about all the new friends he has made and the different planets he has visited. They might also spar a bit, just like in the old days, with Grandpa Gohan giving Goku some pointers.
Well, his stories had a deep impact on me. I learned that there are things in life that we can't explain easily. His stories made me think about the unknown and the power of fear. It also made me realize that sometimes fear can be a good thing, it can keep us safe from potential danger. And it also became a great way for me to bond with my friends as I would retell grandpa's stories and we would all get spooked together.
I'm not aware of any such fanfiction. The relationship between Grandpa Gohan and Son Goku in the original story is one of love and mentorship, so this kind of dark and negative portrayal in fanfiction is not common that I know of.
One possible plot could be Goku reminiscing about his past with Grandpa Gohan. Maybe he visits the place where they used to train together. He could find an old relic or something that Grandpa Gohan left for him, which triggers a flood of memories and emotions. This would be a heartwarming story about their relationship.
Perhaps in the fanfiction, Goku accidentally ends up in a different part of Otherworld where he stumbles upon Grandpa Gohan. Grandpa Gohan could then take Goku on a tour of Otherworld, showing him all the different areas and the souls there. They might encounter some old enemies or friends who have passed away. And along the way, Goku and Grandpa Gohan could strengthen their bond and Goku could grow as a character from the experience.
The main characters are clearly Goku and Grandpa Gohan. Goku is the Saiyan hero who has had many adventures on Earth and beyond. Grandpa Gohan was the one who found and raised Goku when he was a baby. In this fanfiction, their meeting in Otherworld is the central focus.
Grave Robber's Chronicles 9 did not explicitly mention whether or not Black Glasses had died. In the novel Grave Robber's Chronicles, Black Glasses was an important character. He was an experienced grave robber and the companion and friend of the protagonist, Wu Xie. In the novel, Black Glasses had participated in many grave robbing activities and experienced many dangers and challenges with other characters. However, his ending was not clearly described, so it was impossible to determine whether he died or not.