Admins can adopt a series. When a series is adopted, only a single moderator may contribute characters to it. This gives a moderator space to work on a title at their own pace without the risk of duplicates being added by someone else.
To adopt a series, first load up the title, then click the icon at the top. This bring up additional options, foremost the Adopt this Series icon.
Adoptions are intended to last for as long as you need. Please remove them when you are finished, as they do not yet automatically expire after a set period of time.