how would i get access to those? it doesnt list anything from what i can see...
That's what's so deceiving about download a characters card from the net, you don't know anything about it until you try it for yourself.
Well, first thing first, make sure you already install
ALL add-ons (free costume pack, pre-order bonus pack etc) on your base game, so whenever you download a characters card from some website, if the cards can't open/ can't be converted, then you will be sure that these card are using some kind of mods that's not available on your base game.
Unfortunately there is no way to know what mods the uploader are using on their characters card, unless they explain it themselves.
OR the card itself is not a characters card (not contain any character data). This can be happened if the person upload the card are editing the character cards using some kind of program, thus reformat the file and destroy any character data inside the file. The characters card are a specially formatted PNG files that contain characters data. If the uploader using, for example, Photoshop to touch up the characters appearance, when it saved back to PNG all the characters data are destroyed and the characters card are just a plain PNG files without any characters data.