Bleach Hierarchy
Before I post the list I'd like to explain a bit about what the hierarchy is about and how it was constructed, primarily to give the reader an idea of how to interpret the list.
Each tier vaguely categorizes the characters in alphabetic order in terms of general combat efficiency—what they've shown capable of, as well as what's been implied regarding their powers—with standard equipment and power-ups that the character can utilize at-will without sacrifice; so states like Ichigo's Vasto Lorde form will be treated separately. If the character is deceased the character will be ranked as he was before he died.
Since the manga isn't finished and we've not seen everyone fight it's hard to gauge the power of some newly introduced characters that we've yet to see in battle, let alone going all out. These characters will hold an assumed rank based on the circumstances in which they're presented which may change as we see the character in action.
A character doesn't have to hold the Captain title in order to be in a Captain tier, the same goes for any other title and tier. And only named characters will be listed.
If there's anything you disagree with or want changed you're free to post your concerns, but don't expect me to carry over your change my list unless you're able to provide evidence for why a change should be made. I in turn will explain—and provide evidence for—why I ranked a character as I did if evidence if requested.
Now that we've gotten the formalities out of the way, let's go to the list!