Castra’s reference is the character from the Death Parade anime series
Death Parade (Japanese: デス・パレード, Hepburn: Desu Parēdo) is a Japanese anime television series created, written, and directed by Yuzuru Tachikawa. Whenever someone dies, they are sent to one of many mysterious bars run by bartenders serving as arbiters inside a tower in the afterlife. There, they must compete in Death Games with their souls on the line, the results of which reveal what secrets led them to their situation and what their fate will be afterward, with the arbiters judging if their souls will either be sent for reincarnation or banished into the void. The series follows Decim, the lone bartender of the bar wher...