Karl Ruprect Kroenen
- Also known as Karl Kroenen
Appearances
- Hellboy: Seed of Destruction #1 — 1994-03-00
- Hellboy: Seed of Destruction #4 — 1994-06-00
- Hellboy #[1] — 1994-10-00
- Hellboy #[2] — 1997-05-00
- Judge Dredd Megazine #10 — 2002-04-30
- B.P.R.D. #4 — 2005-09-28
- Hellboy: Seed of Destruction #[nn] — 2008-06-00
- Hellboy: One for One #1 — 2010-08-00
- Itty Bitty Hellboy #1 — 2013-08-00
- Itty Bitty Hellboy #2 — 2013-09-00
- Itty Bitty Hellboy #4 — 2013-11-00
- Itty Bitty Hellboy #5 — 2013-12-00
- B.P.R.D. Hell on Earth #116 — 2014-02-00
- B.P.R.D. Hell on Earth #117 — 2014-03-00
- One for One: Itty Bitty Hellboy #1 — 2014-04-00
- Itty Bitty Hellboy: The Search for the Were-Jaguar #1 — 2015-11-00
- Itty Bitty Hellboy: The Search for the Were-Jaguar #2 — 2015-12-00
- Itty Bitty Hellboy: The Search for the Were-Jaguar #4 — 2016-02-00
- Rasputin: Voice of the Dragon #5 — 2018-03-07
- Hellboy Omnibus #1 — 2018-05-09
- Hellboy: Seed of Destruction #1 25th Anniversary #[nn] — 2019-03-13
- Hellboy and the B.P.R.D.: 1952-1954 #[nn] — 2021-04-00
- Hellboy Universe: The Secret Histories #[nn] — 2021-06-02