1) Profanity - Absolutely none. End of story. The same as the masturbation issue with Dell, there are some things that are just too offensive for people, and trust me, there are many people who will not play the game simply because of language (even if there's only a little). It could work Threads of Fate style by using "[Explitive]" whenever there was a swear (in ToF only for a serious swear, but in our case for all). However, you can see how annoying it would be to see [Explitive] all over the place, so the swearing would therefore be reduced. Believe me, there will be many gamers who will appreciate the fact that there is no swearing, and few (if any) who will be stupid enough to be mad that there is NO swearing. There will be many people offended if it's in there, and none offended if it's not. Therefore, better that it's not there, and I think Dev will agree.
Now, of course, we need to define what words we consider "swear words". I don't consder words like crap, piss and suck to be swear words, and even though there are still peole who are offended by these words, I'm not so much, besides I think these words are pretty funny (especially crap - you know, Strong Bad? haha) when used in the right context...well anyway...to stop babbling, I think it's important for us to define what we consider as "swear words". But please do consider my reasonings for not having anything profane.
I'm sure you can come to understand that you don't NEED profanity to make a great story or great characters. Lord of the Rings, ie, has ZERO profanity and ZERO sex. Have you noticed they are the bestselling movies and there are very few people that dislike the movies and/or story? Besides this, profanity shows weakness and immaturity. You will all know how tempting it is to swear in several situations, and swearing shows a lack of discipline and (to be bold) wisdom. I'm not trying to hurt anybody or make anyone feel bad, but...don't you ever noticed how much more intelligence and discipline someone who doesn't swear has compared to...for example, Eminem? Just think about it, and don't take my comments for flame-throwing. Just try to imagine our characters are both cussers and non-cussers, and which ones seem more intelligible.
(Phew, I really pushed that issue there, huh? Ok, moving on then!)
3) Age Level - Teen, but that means about 13-30, so pretty intelligent. Just try to remember what the story is and the mood of the story, and that should help with how smart you make the comprehension requirements (and I making sense?).
6) Name Input - This was never talked about, and I'm not sure I want to integrate this (except maybe as a cheat) because I personally like the consistency of our story with...everything else, including names, know what I mean?...I mean..."ya know?" =) I do enjoy being able to fool around with names once in a while, and I LOVE to hear things like "Dan, you're the only one who can save us!...Dan, you're the Hero of Time!" etc.etc. =) I just prefer to use the in-game names the first time playing through so that I see the story for how it truly should be, ya know?