EFFi is Thomas Petritsch. The name EFFi comes from the literary character Effi Briest of the indentically named book of Theodor Fontane. But why EFFi? Well, here's the link:
„The character describes best a permanent state of inner disunity caused by social restraints and a childish naive romantic spirit of adventure. That sort of feeling is constantly surrounding me“.
He's autodidact and most of the many varying instruments on the album were played by himself during the recording sessions.