This is an excellent topic, Icy.
Those are all great examples listed above, everyone.
Hmm...what do you think Byakuya would do as a career if he was born into the human world?
The vocation of a college professor, would probably suit Byakuya within the human world. I envision Byakuya requiring an occupation, which will stimulate him intellectually, while providing an emotional challenge. He appears to be the type of person that becomes bored easily. As part of his leisure time schedule, Byakuya takes great pleasure in reading and being surrounded by books. He is also a very wise individual. Therefore, any students receiving instruction from him would be considered fortunate, because of this knowledge.
However, patience, when dealing with others is another issue in itself, where Byakuya is concerned.