* BrokenBase: From ''Discouraged Ones'' onward. Smaller contingents extend the cut-off point to ''Last Fair Deal Gone Down'', or shrink it to ''Brave Murder Day''.
* FriendlyFandoms: With Music/{{Opeth}}, no question. It helps that Mikael Åkerfeldt contributed harsh vocals to ''Brave Murder Day'' and backing vocals to ''Discouraged Ones'', in addition to forming Music/{{Bloodbath}} with Jonas, Anders and long-time Katatonia/Opeth associate [[Music/EdgeOfSanity Dan Swano]].
** Mikael's own longstanding association with Music/PorcupineTree's Music/StevenWilson and the fandom friendliness that resulted has also rubbed off on Katatonia fans as well, with a large overlap in all three fandoms. Mikael and Jonas' appearances in Wilson's ''Insurgentes'' documentary just serves to cement it.
* GrowingTheBeard: ''Discouraged Ones'' (1998) and ''Tonight's Decision'' (1999) began the shift to Katatonia's trademark depressive rock/metal sound.; ''Last Fair Deal Gone Down'' (2001) cemented it.
* NightmareFuel: Jonas' vocals on ''Dance of December Souls'', especially on "Without God", will frighten anyone not used to metal screaming. And many lyrics.
* ParanoiaFuel: "Sleeper" and "Help Me Disappear".
* SignatureSong: "Teargas" and "My Twin". For their earlier period, "Without God".
* TearJerker: Any lyrics, verging sometimes into NightmareFuel.