My favourite is... I've said it before and I'll scream it till I'm hoarse - Kuchiki Byakuya!
Zaraki Kenpachi's vice captain is called Yachiru ^^
which brings us to trivia number 11:
Yachiru's zanpaktou hasn't been shown at all
... If Toushirou was the yougest person to achieve captaincy then it can be said without dispute that Yachiru is probably the yougest person to achieve vice captaincy
... She's just a little kid and has been with captain Zaraki Kenpachi since she was born
Her only powers known as of date are:
1. Extreme speed.
2. Ability to project her reiatsu (it's such a cute pink reiatsu that takes the form of an angry cat when she's in a temper
)
I'd love to know what her powers are that make her vice captain over all the other strong people in squad 11.