Alright, time for the next round!
PS: I don't want suggestions. I want each of these rules to be my own creation.
At the next captain's meeting, Byakuya asked Hitsugaya whether or not he'd be willing to let the Sixth Division captain update his list. Though surprised, Hitsugaya agreed, and the next edition of the rules was posted the following day, written in the elegant handwriting of the Kuchiki head and copied laboriously by Renji as punishment for his latest antics.
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14. Vice-Captain Hinamori is not to be set up on dates for the sole purpose of angering Captain Hitsugaya, no matter how amusing the look on his face is.
What's even worse was that her blind date was a nice young man with brown hair and glasses who enjoyed literature. Renji nearly died for that one. As it was, he didn't make it out of the Fourth Division for almost a year.
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15. If you are assigned a mission in the world of the living, you are to actually USE your predetermined cover story any time it is necessary.
Correction to Rule 15: If you are assigned a mission in the world of the living, you are to actually use the predetermined cover story GIVEN TO YOU BY YOUR SUPERIORS every time it is relevant.
Somehow, Rangiku Matsumoto was mistaken for a prostitute after she improvised an explanation for her lack of parents (having forgotten the real one). Then Yumichika decided to have some fun by at various times claiming to be a model, actor, and fashion critic according to a list he had previously drawn up, so it only confused people further when he grudgingly gave his real cover story after a Hollow attack. He ended up briefly institutionalized for pathological lying.
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17. Vice-Captain Kira is not to go to the place called Japan, nor is he to be introduced to the style of music known as "enka" by anyone who goes to the world of the living.
Surprisingly enough, Renji was the one that tackled Nemu, who was going to bring back a CD so Mayuri could experiment with its effects on the Third Division vice-captain. He was reported to have yelled:
"Are you insane?! We have a hard enough time talking him out of his suicidal urges to begin with!"
Momo lent him her binding kido skills in his endeavor. It seemed that she was sick of it too.
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17. Fifth-Seat Ayasegawa is not to be introduced to the human process known as "plastic surgery".
After Yumichika started attending fashion shows and reading Japanese magazines, Ikkaku nearly had a nervous breakdown. Byakuya decided to get in a preemptive strike. They were low enough on shinigami with bankai as it was.
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18. Any jobs taken on during a stay at the world of the living must be approved by your superiors.
Yumichika and Ikkaku managed to create a cult. It was sort of by accident, half intentionally, and focused on developing aesthetic tastes as well as combat abilities. The results were a bunch of macho men bulging with muscles who went preening about, applying makeup at regular intervals. Many children were scarred for life. Zennosuke Kurumadani is currently in therapy.
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19. Neither Head-Captain Yamamoto nor Captain Ukitake, despite his penchant for handing out presents to children, was ever known as Saint Nicholas in the world of the living. Stop asking.
Byakuya was a little reluctant to put this one up. After all, this mistaken belief was one of the few ways to control Yachiru. But Yamamoto was getting cranky from being pestered so often, and they needed the Seireitei intact, not in ashes.
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20. Contrary to popular belief, all illnesses are not curable through large amounts of sugar.
After Yachiru finally found out he was sick, she selflessly attempted to feed Ukitake the entire contents of her secret candy stash. He ended up in the Forth Division and had to get his stomach pumped. Yachiru attributed this to needing more frequent doses.