I'm not a fan of online novels. I'm just a person who likes to read novels. As for whether Blazing Teens will have a sequel, I can't give an accurate answer. It seems that there is no official announcement that there will be a sequel to this work, so I can't provide any information about it. If you want to know more about Blazing Teens: The Legend Reappears, you should go to the relevant novel websites or social media platforms to search.
In general, the Evangelion mangas are considered good. They expand on the anime's universe, providing more depth and character development. However, it depends on personal preferences as some might find the style or pacing not to their liking.
If Yo - Yo was captured, it could lead to some interesting character development for the other agents. Fitz and Simmons could be pushed to develop some new gadget to help in the rescue. Daisy might be forced to confront her own fears about losing her friend and use her powers more aggressively. Also, the captured situation could be a setup by a new villain who wants to lure the rest of the team into a trap. The villain might be after the secrets of SHIELD that Yo - Yo knows.