First, you need to know Jaiden's style and the themes she often explores in her animations. Then, come up with an original idea that could fit within the world she has created. For example, if she often does slice - of - life animations, you could start with a simple day in her life but add a unique twist.
The Dororo anime doesn't cover the whole manga. Some plotlines and details might be left out or adapted differently to fit the anime format and runtime.
The Bleach anime mostly covers the manga, but there are some differences. Some filler episodes were added to extend the runtime, and certain storylines might have been condensed or slightly modified for better pacing in the anime.
The Gosick anime attempts to capture the essence of the novels. It covers the main arcs and significant moments, but for better visual and narrative presentation, there could be minor variations and simplifications compared to the original novel content.