Right then, let me see what kind of ideas I can come up with...
Ab'Zero - Inside a freezer (since most people don't tend to have a cryo chamber in their kitchen...or anywhere else in their house or anywhere otherwise accessible, for that matter ;)). Also, beside a fire or fireplace (probably not too close, though ;)).
Bunker - Next to something military-related (I'm not sure what - it's not like people tend to have a load of guns or a tank or whatever sitting around their houses, but erm...I dunno, there are a few military museums around, aren't there? ;)).
Fanatic - Next to something obviously Christianity-related (since that appears to be her religion, though I can't recall whether that specific oneis mentioned by name - the symbolism used would seem to make it clear, though).
Haka - Near some happy small children of playgroup-attending age (I think that's what Kindergarten is, yes? Pre-school age?). Somewhere that looks like New Zealand (because we can always pretend that it is ;)). His alternate version can be hanging around in a library, of course.
Legacy - Next to something blatantly America-related, ie preferably featuring the flag in some way.
Ra - In or beside a structure made of sandstone (that being what pyramids and stuff tended to be made of, I believe). And/or near some fire.
Tachyon - Somewhere obviously scientific, if not an actual science lab. Or lots of different places, with the time on the clocks visible in every image depicting that only a couple of seconds have gone past between the taking of each picture ;).
Tempest - Beside a river or sea (or a similar body of water). Or somewhere (preferably natural, like a field or forest) with a stormy sky visible in the background. Bonus points if there's actually a lightning bolt going off at the time :D.
Visionary - Hmm, tricky one. Nothing actually springs to mind, here. Maybe she could be a step or two just to the side of some kind of obvious disaster which has managed to miss her because she took those couple of steps to the left right before it went off, without needing to physically look and see it coming? I dunno.
Wraith - On top of a high building (like a skyscraper). Or somewhere really poncy-looking with posh furniture and stuff (she's rich, after all). Or somewhere with lots of knives or similarly pointy objects.
Expatriette - Um, somewhere in which you can in some way get a gun into the picture, I suppose. Probably therefore about as difficult as Bunker ;).
Mr Fixer - A car-repair garage. A martial arts centre. A peaceful hillside (cherry blossom trees optional ;)).
Adept - A natural setting (with trees and stuff, no man-made stuff visible). Somewhere with lots of musical instruments.
Nightmist - A library or similar location full of old, big, leather-bound books that look like they probably contain a load of ancient, forbidden lore. A dimly-lit room with candles and pentagrams and other stuff generally linked to the occult.
Chrono-Ranger - Somewhere that evokes the feel of the Wild West, naturally. Or somewhere that looks...wild, as though nasty scary monsters live there and a Mongolian Death Worm might pop out of the ground at any second ;).
Omni-10 - Somewhere with a load of high-tech computery stuff, I suppose.
Scholar - Somewhere natural, with plenty of trees and rocks that look comfortable to sit on/lean against. And/or a caravan (I think that's what he lives in, isn't it?)
Unity - Somewhere with a work bench and a load of scrap metal sitting around.
Some of those are probably gonna be difficult/impossible to get depending on where people live, I suppose, but you could have the fun of improvising or something, right? ;)
