I don't know of any heroine that is like Mare, I know of one that looks like her. Kuki Monshiro from Majikoi S, but they have different personalities.
I don't know if it was of any help, but this is what i have to give :v
They are working on the translation, don't know if it's for PsVITA as well, I don't know the extraction process, but this is as much as I can do
http://libraryshepherd.tumblr.com/