Thread:Mangetsu20/@comment-4280197-20140116121310/@comment-4326112-20140123215924

You're the Author. Its really up to you. Depending on how aligned your story is to Canon (I'm pretty sure, since you're asking, you're trying to keep close to Canon) depends on the changes that would be reasonable in making to better acquiesce the plot. If that means you want to keep particular, major characters from dying or tying in the existence of a Filler Character, just make sure you instill a single or multiple valid reasons for something out of Canon to be existing. The better the explaination and the set-up, the easier it is for a Fandom reader to immerse himself/herself into the plot you are writing.

Just make sure everything is within reason of BLEACH's known laws, physics and timeline that is majorly considered factual or not hypothetical data.