I was gonna suggest Petra Sleptova for idek and then I remembered she's not longer haunting the Hogwarts library...

I do have Hesper Gamp though, she'll probably become a very familiar sight in the library as exams get closer. Not sure she'll be the most exciting thread opportunity yet though, she needs some development.

And last but definitely not least: Parthenope Lufkin is the Hufflepuff Matron! She's new as of the start of the second semester and not too far off Persephone in age. She's a thinly veiled raging feminist. Her sexuality is undefined tbh: she's attracted to men occasionally but also strongly objects to men as a concept so that's awkward for her. Women she's more relaxed around but I don't think she's ever considered them in a romantic light, possibly because it's not really occurred to her possibly because she's tragically straight and doomed to resent any man she thinks is hot. I DON'T KNOW YET ITS FUN.

I do actually have Adelia Lovegood coming back soon because certain individuals on this hellsite are evil and encourage me to make poor life choices at 3am. Ada is freshly turned 30 and also a Ravenclaw! Sadly they juuuust missed out on being in the same school year but that doesn't mean they couldn't be friends!