There are already a few of these out there, however I would really appreciate if there were more multiversal, DxD centered Bleach fan fictions. There's a pretty prominent one of these on this website already, but that's the only decent one I can find. If possible, I'd want Ichigo as the main character; the circumstances of how he gets there are something you can make up on your own, as is also the case with any characters from other series you decide to include. In addition to that, Kisuke Urahara is a highly underused, at least in my opinion, character that can bring a lot of spice to a multiversal fan fiction, though that's just a thought. I'd personally prefer you add him, despite the fact that he already has his own multiversal fan fiction here on Webnovel with over 600 chapters. But yeah, any method of Ichigo getting to the initial world of DxD works fine, whether it be him getting swept out by the current of the Dangai, a failed time travel attempt, death and reincarnation, or anything of the sort. I almost forgot to mention this, but I'd prefer a post TYBW Ichigo that has Hollow Zangetsu (Shiro), Quincy Zangetsu (Juha Bach), Muramasa, Hell gate control, and the Hogyoku. Perhaps involve him with Amaterasu and other related supernatural affairs in the DxD world before eventually sending him to other worlds. He would of course, preferably return to the DxD world as a sort of hub world.