The people behind Charahub seem to have been really, really busy lately. At least according to their latest answered ask from their tumblr page (which was posted on February 11th).
I sent them an ask last time the site was down, but didn't get an answer. The site started workind on the same day, though. I don't know if they knew about the site being down? We haven't heard much from them lately. I'm kinda worried about charahub's future and I recommend everyone to make backups of their character profiles! If you haven't copied the info anywhere yet, please do that asap when the site is online again!
(Also I just sent them a new ask on tumblr. Hopefully the site will be back online soon!)