Some Basic Rules
Two character maximum per person, unless said person is already done both charies ahead of schedule
Any Mass Effect characters can be claimed, whether from the games (including DLC and multiplayer), movie, books, comics, even OCs.
Since there are six differnt classes Shepard can be, and there can be Male!Shep or Fem!Shep, there can be a total of 12 different Shepards by default. So, if claiming Shepard, specify which class and what gender.
As of now, it's two of each Shep MAXIMUM (two of every class AND every gender). That's kinda a lot, but it seems pretty fair.
Pretty much any clothing style is is acceptable, whether it be armor or civilian clothing, as long as it makes sense for the species and context. For example, Tali could definitely not be wear a bikini, being a Quarian and easily ill, but Kaidan or Ashley could wear hoodies and jeasns, since Shep can have an N7 hoodie in game 3 as casual wear.
Also, if you're not really familiar with Mass Effect, feel free to peruse it's wiki and it's TV Tropes series and character pages.
AND, here's an awesome gallery of full body character refs for a ton of characters. Much easier to have an idea of how to doll their outfits when you can see what they're wearing from different angles.
Okay, I've decided to give us a whole extra month in case more people join. New deadline's October 20.
I'm leaning towards KawaiiHannah's Sumimi. There aren't too many male poses for it, but base-editing is totally a-ok, we got this.
Nylah Shepard (Vanguard Fem!Shep) - Vanity~Sweet
Mordin Solus, Ricardo Shepard (Adept Male Shepard) - Krahka
My e-mail is fully working again so I should be able to stay pretty up-to-date with this. And in case you can't tell, I'm kinda excited about this. XD