When you see a character that you know is similar to one of your own, how do you respond?
Are you flattered they liked yours so much or angry that it's basically a knockoff of your own?
It depends on the design, and who the original artist for /my/ character was. :3 If it were, say, me who made it, and it were a complex design, I'd of course be rather confused, if not a tad livid. If it's incredibly simple, say, one flat colour, then I'd understand and simply let it go.
But, as noted before, if it were a particular design a newcomer who happened to glance at both, and asked if they were the same character, then I'd probably ask them about it. However, I'm not one to get upset to the point of when it was made, but rather I'd simply change my own character, or if I know said person enough then they could be family. Basically, find the best way to transform either character into being a copy into making sense. :3 Aaah. Or if I didn't know them I'd get angry and flip out on them. But probably just kindly ask them about it. And if they reply with something along the lines of "You copied," then I'd flip out.