Character Dev and Creation:http://fuckyeahcharacterdevelopment.tumblr.com/post/50825149893/character-sheets-and-character-creationThis one has a lot of resources, be warned though some of them can be very time consuming if you plan on completing them.
http://www.be-a-better-writer.com/creating-characters.htmlThis one is a bit of a typical writer's aid rather than specifically for RP or individual characters, though it can be very easily used as such. The rest of the site beyond just this page is worth a peek too.
TVTropes'Nuff said. This site is the proverbial Bible for all things entertainment. Spend some time browsing it and you'll learn the ups and downs of certain "tropes" and how to avoid being cliche/overpowered/boring. WARNING: The Wiki effect is at full power on this site, if you are not careful you WILL waste a lot of time.
http://www.helpingwritersbecomeauthors.com/most-common-mistakes-series-is-your-2/Again this is good advice for any kind of writer, but it's good to have for NationStates purposes.
Name Generator:http://www.thinkcalculator.com/generator/Thinkcalculator has practically everything from businesses and SSN and Canadian and UK equivalents to names from specific franchises. It can also be used for a ton of other things regarding calculations and conversions (go figure).
http://fantasynamegenerators.com/http://rumandmonkey.com/widgets/toys/namegen#.VdPZMbJVikpA lot of variables with this one including things like band names and strippers, downside is things can be random to the point of being nonsensical some of the time.
http://www.chronofus.net/wargames/amazon/names.htmThis one is less of a generator and more of a list, all female. It is comprised mostly of Amazon names but does include female names from other cultures such as Greek, Arthurian, Celtic, Roman, and Norse (And a few others). Most of the names are warriors or prominent figures in mythology with some listed with a meaning or explanation of their fame.
http://www.behindthename.com/A site normally used for parents to find a good name for their baby. I use it for getting unique names for characters from specific cultures. It also gives meanings, origin, and nationality(s) as well as variations of the name.
Edit: I done goof'd, it seems this one is already on the OP's post.