Hmmm, recently I read up to the latest available chapter of the novel (It ended with the end of the arc, so not a big cliffhanger, and I hope it to continue eventually), but I certainly wondered how Claire became "what she becomes", it didn't really show anything about her family, but seeing that she comes from a family of "meatheads", I guess I can see why she is so gullible and "strength seeking" to the point she may very well be an idiot sometimes.
Also, I don't really remember much, but I think the first interaction between Ix and her was slightly different in the Webnovel, although she did complain about them being late, rather than all the shouting, Ix mostly just ignored her, and that got on her nerves, so she dueled him.