So for the Tardigrade idea I had decided that because I'd searched them up randomly one day. I liked these books, let me write a One piece spinoff. I picked the name Jacob because I had a friend named Jacob. Then, I decided to do the thing when they are transmigrated as a baby. I made him related to Silver Rayleigh because he was a cool character, and I like the color Silver. I made it that his sister and brother in-law were attacked for their relationship with Rayleigh being apparent and then I went off without making up random shit lol.
I'm going re-read the manga and anime so I can describe settings and have in more details the outfit of the group and little things like that, and I'll add side story arcs and new arcs related to main story. I'm going to talk about Sabo's and Aces journey, I wrote about Luffy's 2,500 words, but I forgot to save it and my computer shut down. I'm too lazy to write it, I'll probably write it later for fun as I develop as an author. It is not too relevant to understanding too much of the main story.
I picked One Piece because it's a broad topic, and I could make random shit up and it's what's in my memory currently. If I wanted to do Dragon Ball, the power scaling would be too much for me to comprehend yet write about. For a Naruto one, it would probably be what if Naruto had a Decay Quirk since I'm on Season 6 of My hero and caught up with the manga. I feel like it would be interesting to see how it plays out. I'll make a chapter either April 3rd(Today) or tomorrow April 4th, and if I can come up with ideas, I'll add the story. I'll be putting 2 chapters for this story, and 1 chapter for the Naruto Decay one. I won't be consistent, but there would always be a total of 3 chapters every weekend unless something occurs or I vacate.