Please give constructive advice if you can about something that has been bothering me.
Hmmm how to explain this. Lets say you have a like for a mainstream character, you have your own art style, your own OC, your own way of coloring and a fair amount of people know you on dA. your art is consistent in themes and you have established your style rather well to the point that your art is recognizable without even seeing the signature. You like to do trades with people from time to time and it usually goes quite well until one day, someone comes along and asks you for a trade. Trade goes well, both put a watch on each other, become friends yadda yadda. Then very shortly after, your new "friends" art starts making a very dramatic and obvious "shift". It starts looking like YOUR art. Same colors, same style, their OC now looks nearly identical to yours (same clothing, details, jewelry, colors), same settings & themes, same interest in the same certain character, and even a fanclub for their oh so orignial couple (also a copy). The second you do ANYTHING at all, it is almost certain that your copy with have something coming down the pipe that is an blatant rip off of what you did, all the while denying it. This goes on to the point that people are starting to assume that your copycats account is actually a SIDE account of yours and that you are posting art in TWO places. Talking to the person in question is impossible because they cannot see things rationally and refuse to consider that they are doing anything wrong at all.
They can't really be reported to admin? It's not...quite that extreme even though it's hella creepy. What do you do?
This isn't about me, I've just been a bystander for a while now, keeping almost quiet about it. If it were about me I would just start a flame war and it would rain fire and lava until 2012 came early or I got banned. But, in an attempt to be slightly more diplomatic....I'm asking for reasonable suggestions in dealing with the problem. Cause I can't figure out how to resolve it.