With regard to cats?
And not only.
most black cats I met have been rather aloof and distant and generally weird.
That's part of their charm. Mini panthers.
When a cat (or any creature really) is taken too early from it's mother it becomes very needy.
House cats are very often permanently infantilised.
Mine is, in human terms, a 30 year old mafia thug.
About fur colour, there are respectable theories suggesting a correlation with particular traits.