I would like to say a few words to comment on their character(s).
I am wondering if "character" in the sense of qualities of personality is a count noun and can be pluralized. Macmillan and Cambridge dictionaries are vague with reference to this. Macmillan says this specific usage is countable, while Cambridge suggests it is countable and uncountable.
When I talk about multiple people's different personalities should I use the plural?