I'm going to assume this is impossible but who knows - here goes.
Is there a way (with a Squiffy adventure checked in to textadventures) to gain information from a pre-specified location on the user's computer? For example, if the user wanted to put in his name and picture (say on "C:SquiffyData") could this be recovered for use in the game?
I know that it could be done with the game in it's development mode (i.e. in a folder on the computer) but I don't know if a game in the textadventures library can accept user data.
Without building a bespoke browser extension, no you can't call images from a user's hard-drive. It would be a rather serious security vulnerability if it were possible for a web page to access a user's hard-drive so easily.
But why do you want to do this? Why not just store the name via a Squiffy attribute?
Entering names for characters is fairly easy. Look at the documentation for attributes.
If you want to go down that path:
But if I was you I'd stick with the names but drop the images.