I've always been interested in learing more of Brennan's past in foster care. Also Cam and Sweets. Angela's past might be interesting because of her dad. I wonder what Hodgin's past was like?

Well because mostly Brenna's past was in the series,i would love to know the past of Booth,Hodgin's,Sweet's.
Maan from all the abuse he has taken from the past sense little until now,Booth body look's like shit inside for sure even more then whe know ^^

'Would like to know more about Booth's past, from his parents to why he became a sniper in the first place; why he buried himself in work till his feelings for Brennan surfaced; basically everything else about his past as well as the others (Angela, Hodgins, Cam,Sweets) expect Brennan's which we know about almost everything.

I am really interested in her foster care experience!

I also love the whole story line about her parents.

I would like to know more about Booth. Though Brennans foster care experience would be good and also a bit about Angela, like what her birth name was.