|Release date||28 March 2011 (Update)|
|Also known as||Seagull|
|Quest NPC?||Rocking Out|
|Location||Rock Island Prison (Only while Rocking Out)|
In A Clockwork Syringe, he reveals his identity, as well as his ability to communicate with the player through the use of the Summoning skill. He reveals that he plans to exact revenge on the player for the prison incident, upon which players may choose to claim that their unorthodox method of arriving at the island (through the use of a Cannonball barrel-boat) as a "gesture" for making up for the player's "atonement". Either way, players ultimately enlist his aid to destroy several barrelchests guarding Bloodsplatter Isle; using the Summoning skill, players control the Baron in flight and drop bombs on the barrelchests. He is not seen again afterwards.
- The Baron's name may be derived from the fact that seagulls often leave their droppings on people's hats.
- Baron von Hattenkrapper's name is also likely a reference to the character Baron von Trapp from the musical The Sound of Music.
- The Baron is not an NPC. He is not selectable in any way, only the rock he perches on. Ultimately, this means that he does not have an examine text, and is one of the few interactive NPC's in the game to do so.
- His eyes are barely visible, as a chathead and as an NPC.