I don't have the exact date of when Jubei was added to Central Fiction off the top of my head. But a good way to find out is to look at the game's patch notes or ask other dedicated players in online gaming communities.
Well, Jubei in BlazBlue Central Fiction has distinct features. One of them is his agility. He can move around the battlefield very quickly, which gives him an edge in combat. Also, his special attacks often have a wide range of coverage, allowing him to control the fight to some extent. His design is also quite appealing, with his traditional Japanese look.
Perhaps an old rival of Jubei's who has turned to the dark side. This character would know all of Jubei's weaknesses and fighting styles, making them a formidable foe. They could be plotting to take over the BlazBlue world and see Jubei as the biggest obstacle in their path.
I have no clear knowledge of when Jubei will be released in Central Fiction. Maybe you can search in gaming forums or follow the game's social media accounts to get the latest on this.
Maybe a fanfic where Jubei takes on a young apprentice. This could show his mentoring side and how he imparts his knowledge and skills. You could include scenes of training, as well as the apprentice getting into trouble and Jubei having to rescue them, all while teaching important life lessons.
The Japanese samurai mask had many uses. First of all, the mask could cover the face of the warrior and protect his privacy. Secondly, the mask could be used to intimidate the opponent. The ferocious appearance of the mask could intimidate the enemy. In addition, the mask could also increase the aura of the warrior, thus suppressing the enemy on the battlefield. Masks were divided into three categories, including half a head, cheeks, and full face. Half of the head covered a part of the face, the cheeks covered the face below the eyes, and the total face covered the entire face. Masks were usually made of iron, and there might be beards and other animal hair decorations on them. The method of making the mask included beating the iron plate into shape, then finishing it, and finally tying it to the face with a rope. In general, the mask of the Japanese samurai played a role in defense, deterrence, and increasing momentum in the war.