plot should be first, I'd like to have that plastered some where.
Current Events:
-War Between Espada and Soul society
-Liuetenant Takami Kawamru is defecting from soul society.
The captains are meeting to discuss this.
-Demons are causing trouble in Karakura Town
-The Espada have reformed and now they are planning an invasion on soul society.
Vizards are joining up the espada
To establish and overall plot we need an overall theme first, what is the goal of this plot? If not a goal or destination then who does this plot revolve around. I know everyone wants to say the rpers but it should revolve around one group, SS, Espada, Demons, etc. Seeing as there is a bit of chaos going on in karakura town I suggest someone knew to lock up the place. Meaning you can get in to the human world but you can't get out. After tricking, ss, the espada, and the demons, to come to the human world for something. An unknown enemy should lock up the human world preventing them from going home.
Once they accomplish this much the unknown enemies can say that the place they are in is on a different plane of existence. It's not necessarily the human world but a world that they control. The bad guys could've brought them here to kill them all and take over their world. While others in this same dimension could seek soul society out for help. Thus the birth of two new original groups. But both of their goals can still be a bit shady.