It's a very difficult situation, especially because coincidences do happen. My friend's notorious for making extraordinarily similar designs to other people, even though she's never seen their characters before! Given that there's a limited supply of markings, it's likely you'll bump into a similar critter at some point. However, if they blatantly log off in front of you and yoink your character, that's a different matter entirely!
Names, too, are pretty tricky. I certainly arched a brow when someone stole my character's name- 'Drek Avanji'. That's a bit too extraordinarily similar. However, Guay, Nemena and such are ones I'd be able to shrug aside after a bit of frowning, providing I'm not approached by them. After all, they're short enough names to be down to coincidence, too! In terms of copyrighting a name, it'd be painfully difficult. FH's a relatively small community but there's a large, expansive internet out there. Even the most obscure of my character names plucks up a good 80 results in google!
It always irks me when people accuse others of copying when they're using rather common concepts. Complaining about names like Shadow, Dark, Creed and such being stolen is akin to a black wolf accusing the other dozen black wolves of thievery! Whilst I find it a touch hurtful when something of mine's blatantly copied, sometimes you need to take a closer look to see if it really is just an innocent coincidence-- or something a little more sinister.
Even so, a polite whisper often helps when it's obvious theft, for example: "Hey, I'm upset that you've copied my character. Please could you change it?". I've had more people apologize and change than berate me, surprisingly! If all else fails, block and weep quietly in a corner move on.
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