Mind you I used to have 2 blue roans - both related (half brother/half sister) both very different, like chalk and cheese
Yes that's the case with many of our blues over the years - some have similar traits & some completely different (same with human siblings of course as one might take after one parent/grandparent and another will take after a different relative) But that again shows it's not colour deciding what temperament our dogs have as we can have the same colour with different temperaments (as Sarah describes) or the same colour with similar temperaments or anything in between 
I know that's the thing isn't it even if you had all of one colour they would be different so not colour dependent
