What is some cultural information about Greco-Karaite Jews?

Nothing

The Constantinopolitan Karaites or Greco-Karaites are a Karaite community with a specific historical development and a distinct cultural, linguistic and literary heritage, while they share particular commonalities with the Romaniote Jews.

Karaites have lived in Istanbul (at that time the city still bore its Greek name Constantinople) for more than a thousand years since Byzantine times. Smaller settlements in the surrounding area of Constantinople have existed as well, like the Karaites of Adrianople who had their descent from the Constantinopolitan community. After a long time of coexistence within a large Greek-speaking Christian town and beside of the larger community of the Rabbanite Romaniote Jews, who were either grecophone, the Karaites began adopting the Greek language. As a result, the Karaeo-Greek type of the Yevanic language developed, which the elder ones used in their daily conversation until recently. The Karaite Elias Afeda Beghi compiled a glossary on the Hebrew Bible with Hebrew words translated into Greek. Other works of Greco-Karaite literature are also known.

Im a democratic guy, to me all jews are the same. 100% Ayrabs.

Old branch of Judaism.

So old, even Hitler did not consider them Jews.

However Fakima does...