Grim Reaper by Miyajima Noboru

Diagrams in Czech Origami Convention 2012
Diagrams in Tanteidan 5th convention
Diagrams in The Beauty of Origami by Makoto Yamaguchi
Folded from a square of duo tissue, treated with MC

Grim Reaper by Robin Glynn

Diagrams in The Art of London Origami
Folded from a square of origami paper

Hell cat by Robert Harbin

Diagrams in Origami 4 by Robert Harbin
Folded from a square of double-sided Unryu paper

Hippocampus by Quentin Trollip

Diagrams in Origami Sequence by Quentin Trollip
Folded from a square of Tant paper

Hydra by Paul Frasco

Diagrams in Fantastical Creatures by Paul Frasco
Wet folded from a square of lizard hide paper

Icarus by Hojyo Takashi

Diagrams in Origami Works of Takashi Hojyo by Hojyo Takashi
Diagrams in World of Super-Complex Origami by Satoshi Kamiya
Folded from a square of wrapping paper

Icarus Mid Air by Joseph Wu

Folded from a square of Nicolas Terry's tissue-foil

Medusa by Mario Adrados Netto

Diagrams in Dragons, Witches and Other Fantasy Creatures in Origami (Seres de Ficcion) by Mario Adrados Netto and Jose Anibal Voyer
Folded from a square of tissue-foil

Minotaur head by Gilad Aharoni

Diagrams in Argentina Convention 2010
Diagrams in BOS Convention 2010
Diagrams in Chilean Origami Convention 2010
Diagrams in Christmas Origami Book 2008
Diagrams in MFPP 2013 Convention
Diagrams in Origami Deutschland 2010
Diagrams in Origami USA Convention 2013
Folded from a square of double-sided Unryu paper

Monster by Joao Charrua

Diagrams in BOS Convention 2019 Spring
Diagrams in Lisbon Origami Convention 2018
Diagrams in Mini Neo 28
Diagrams in Origami USA Convention 2017
Wet folded from a square of scrapbooking cardstock