About the Fullbringers, Yukio took over his parents company and, true to his word, gave jobs to Riruka and Jackie. Riruka becomes a fashion designer while Jackie does charity work with Yukio's company in Africa.
Komamura is officially listed as Killed In Action during the war, but in actuality lives as a wolf in the mountains. During WDKAL, Komamura seeks Iba out and puts him charge of a pair of cubs from his clan that want to become shinigami. In a nice bit, it turns out that the cubs can understand both humans and animals, so they serve as translators so that Komamura and Iba can have one last conversation.
Because the Gotei 13 lost so many people in the war, Kyoraku makes Yoruichi chose either become a Captain again or help out at the academy, she choses the latter.
Urahara survived, but for some unexplained reason he stays away from Soul Society.
A lot of the Quincy actually survived and Mayuri even revived some of the ones who died.
The bad guy in CFYOW, and one of the members from the Nobel Families, is Tokinada Tsunayashiro and he was husband of Tousen's friend who killed his wife and was never punished for it due to his noble status.