A generally pleasant people, they had a strict legal system. For example, murderers were forced to relive their victim's last moments periodically, by means of inserting the memory engrams of the victim into their brain. The medical technology that made this possible was very advanced by Federation standards. Prior to this method, lethal injection was the means of punishment for murder.
There were several Numiri spies among the Banean people. In 2371, one of these spies framed Tom Paris of the USS Voyager for the murder of the Banean weapons expert Tolen Ren, after a dalliance with his wife Lidell Ren. (VOY: "Ex Post Facto")
The Banean heart was located through the intercostal space between their eighth and ninth right ribs. They had distinctive forehead ridges similar to the combs of some species of Earth birds, and feather-like structures around their faces and on their brows. (VOY: "Ex Post Facto")