Hi there, sorry for a late reply. As far as I know there is no aggregated list of such easter eggs in an article. I can talk to the admins and see if that is something they would be interested in to include in the wiki.
Thanks for your answer,but can I ask if there are some new articles about the new chapter of Umineko?
I'm assuming you are referring to Umineko no Naku Koro ni Saku?
The page can be found here. We currently do not have much on the page as we are waiting for the release.
Thank you,Brokenmeteor! You're really as useful as flippingboards.wordpress.com for analysis on the Umneko franchise! I think you know that site,but I can't find even a stub about Black witch Rosa!
Thank you for your kind words, we try our best to document as best as we can. Currently the only reference we have for Black Witch Rosa are a quote from maria about it which can be found on Rosa's page. Please remember that these are filled with spoilers so if you haven't read through proceed with caution.
Just had one more thought. Perhaps you were thinking about rosatrice? (again spoilers).
No,thanks. Rosatrice was one of the first articles that I've read on this wiki,and it's very interesting still today. What I was looking for is an article about all that non-canonical stuff that is related to Black witch Rosa,that I found on that site"flippingboards.wordpress.com" but I can't really understand very well
What do you think?