Rules for line separation

[Scoobyqueen]

as title

[Lu]

AFAIK there's no such rule. There's no danger of a character being split over two lines, and it's no problem if the second (or more) character of a word is on the next line. Grabbed a random Chinese document on my desk to check, it has 高 [line break] 雄. So, no problem.

Sometimes you even see a full stop or comma on the next line, especially in older documents. I think nowadays that's considered a bit sloppy, and usually avoided.

[Hofmann]

I vaguely remember something that has to do with people's names. You couldn't split them or something.

[imron]

From a computing standpoint, it's mostly just punctuation that can't be the first character on a line, plus a number of leading characters (also punctuation/numeric) that can't be the last character on a line. See here for a list of line-breaking rules in Asian languages.