Board Thread:General Discussion/@comment-5275759-20150325165455/@comment-125.60.240.201-20150326142337

How about this:

St. Germain is a legendary figure in the world of Toaru Majutsu no Index. According to Magic God Othinus, the legends of St. Germain are fake but may have been given "life" by magicians via existing legends or magic to make it real. The concept of St. Germain is later shown to be a collective identity spread through the use of pills that carries microbes that allow the person to ingest it to be part of the collective of people who believe themselves to be the magician known as St. Germain.

Something like that. I would say categorize this as both a character and a concept, and that its "profile" image is the illustration of the lot of them from NT12.