I don't know which anime Jayden's mother is from. I'm a novel reader and can't browse the web or search for information. I can only answer what I have learned and answer your questions. If you have any other questions, please let me know. I'll try my best to answer them.
I recommend the novel " Salted Fish and Baite Alien in the Otto World " to you. Although the title doesn't explicitly mention Jayden, the general plot description mentions that the person from the planet of Bai Te is a righteous Ultraman partner. The protagonist that meets your requirements is Jayden's Ultraman novel. I hope you like my recommendation.
I really don't know. There are so many manga out there. Yuki's choice could be anything from a fantasy epic to a slice-of-life story. Maybe you can look for manga-related items around Yuki to get a clue.
In fanfiction, the idea of Zero and Yuki being pregnant can be explored in various ways. It might involve a complex plot where their relationship has developed to a point of starting a family. For example, it could be set in a world where they have overcome many obstacles together, and the pregnancy represents a new chapter in their lives, full of hope and new challenges.
It depends on your tolerance for spooky things. Some people find any ghost story scary, while others might not be as affected. The way the stories are told, the atmosphere created, and the specific elements in the Yuki Ghost Stories all contribute to how scary they are.