I think one look at the wiki pages for Ganale, Tahz, or Chao make my position very self-explanatory. That said, they, and all my characters, are actually rather reticent to actually talk about their past in anything resembling casual conversation. One of my as-yet-unwiki'd characters, Ghost, refuses to talk about his past at all.
Chris Ganale | R'tahz Tia | Yuuna Akashi | Chao Lingshen | Seno Nakakami | L'dran Cresnoble | Garon Crayson