I wish Kubo would elaborate on Yoruichi and Urahara. They left the Seireitei together, stood against Aizen without a bankai, and apparently Urahara has studied the healing waters in Squad 0 where no one is allowed. Who exactly are they and why are they so strong and smart?
"[Sarah Michelle Gellar] really taught me a lot. I can’t say enough about what I learned from her about getting your marks, hitting your lights, the demands of the role that she was under, the crazy hours. It was an ambitious show. I’d really like to see her again". - Charisma Carpenter