I'm brazilian and I think most brazilians (and south americans, like if we were all the same in these countries) are much more passive than russians (or eastern europeans, like if they were all the same). But that is just "air", a guess, it doesn't say anything about the player sitting on my table.
HUD data, your notes, the
hands you played against that player and the hands you watched him play those are data that you will help to build an image of that player.
Other than that..... take notes because someone is from Brazil or Russia.... seriously? #séloko
Sharkscope is also a great tool, but since I don't have a premium account (limited to 5 searchs/day) I usually only sharkscope someone when I keep seeing him everytime or final tables (which are rare for me).