Question: what is Charlie & for the root user? I didn't gave Charlie & for gecos field, I think I didn't gave any at all. ps.: the /sbin/nologin doesn't matters, I just tested something
What is Charlie & in the gecos field on OpenBSD for root?
openbsd;history;passwd
That is the default you get if you leave it out. It comes from Charlie (the) Root (user) and I've seen it show up as a name over the years in articles and papers. Don't know where it orignated but at least before 1995.The & in the Gecos field is automatically replaced by root.It is mentioned e.g in Matt Bishops paper (page 6). And it has its own  wikipedia article which says that it is a reference to the baseball player Charlie Root