Kestrel said
As a player I sometimes choose not to read sheets outside of appearance and such to avoid meta-gaming. It has absolutely nothing to do with disinterest. It is so that that my mind will be as blank as the my character's, making it more difficult to slip up.Also while character variety is nice, it's also a luxury. What if all the archetypes I like are already taken? Should I settle for a character I like less? What if my writing experience falls short of writing X type of background or character? Should I not join the RP at all?
You can tweak your character so as to compliment the similar character rather than randomly having huge overlaps without addressing them. Case in point, I was once in an RP with somebody where there were two characters particularly skilled at battling where that was their main 'thing' each. Instead of this being player vs player conflict, we turned it into character vs character conflict and used it as plot points and elements of each characters' arc.
My character was an alpha male with questionable (ie: nazi-lite) views and the other character was a gutsy young woman, triggering a whole set of what-ifs. What does it do to my character if he loses in a battle to a woman, whom he'd presume to be weaker than him? What does it do to her if she loses to him, thereby 'proving' him right?
By putting some thought into our characters, we both got what we wanted from our characters (and more) without stepping on one anothers' toes. On the face of it, both characters were very alike in their role in the group (leadership qualities, determination, combat prowess, hot-headedness), but we played it to our advantage - only possible because we worked on our characters with knowledge of the other one.
In the same RP, I had a second character that was thoughtful rather than forceful, lacked confidence, and, frankly, much practical ability. To compensate for this, he had the unfortunate hobby of delving into the powers of ALL THINGS EVIL in order to deal with the same situations the others could breeze through. However, there was another character that was largely the same, and they felt like awkward re-hashes of the other, embarking on the same, but largely unconnected, character arcs.
On the other hand, there will be some situations where it would be simply inappropriate to use the same traits as another character. For example, in a 'team' RP, in which each character brings a different specialism to a team, doubling up is pointless and may well mean that two tech specialists cause a vacancy in a different (necessary) field. A GM-approved character in one specialism is set in stone and other players should choose different roles on the team, so, in that instance, I'd say you should probably choose a different specialism or a different RP. This isn't really character traits, though, and is hopefully not really a controversial suggestion.
For me, meta-gaming only occurs when a character is being given information that they shouldn't have access to. It's not meta-gaming to use your knowledge of the game as the player to guide your character into circumstances and events to make the story itself happen. That's to me, the way to make the most out of an RP as a story.