See to a point I understand what you mean, but there is a line you yourself can create. In my time here, over the years, I have interacted with a GREAT many people. Some people have always been allies, some people are ALWAYS enemies (thats you H&R) but whenever I know who plays them, I don't really draw an OOC aspect from it, I like to compete. Like anything a bit of competition makes victory sweeter. I mean hell Anister blew my poor syndi blm to ****ing pieces thanks to fireball being fixed. I still like (kind of) H&R.
Mindflayer was Kurvikhel, well **** him
(obligatory smiley face).
On a side note I see common things between chars that are too easy to identify most of the time. Little things that players do that is common between all their chars. For example:
Rping while mercying someone
Running patterns (I really think this is the biggest identifier of all. If you can chase me consistantly, your a good chaser. Because my runs are always random ALWAYS)
RP style. Alot of people will make a new char, and it has very similar RP and thought process as their previous. Out of lazy, or they are just so used to char X, they struggle to transfer to char Y.
There are more, but you get the idea.