The anatomical features of Gamera and his foes are detailed in a set of illustrations found in one volume of the Kaijū-Kaijin Daizenshū movie monster book series published by Keibunsha in 1972.

Gamera

Gamera's features include infrared eyes with night vision, arms that can lift 50,000 tons, an organ for producing the flames he shoots from his hands, electrical spikes on his back, poison claws, sac-like organs for storing lava, coal, oil and uranium, balloon-like organs that blast jets of air out through the feet, and a tail of elastic cartilage that can deliver a powerful punch.

Guiron

Guiron's most prominent feature is his knife-shaped head, which is 100 times harder than diamond and is packed with shuriken-like stars that can be fired from a pair of openings above the eyes. The creature has 360-degree radar vision, 60 times more teeth than a piranha, lungs adapted for long-distance space travel, sac-like organs for storing energy and uranium, balloon-like organs in the legs that blast jets of liquid through the feet, webbed fins for stability in water, and magnetic suction cups on the hands.

Barugon

Barugon's features include dorsal spikes that produce a deadly rainbow ray, an organ to produce frosty liquid (-100 degree Celsius) that can be shot from his 30-meter-long weaponized tongue, a stomach that can digest diamonds (his favorite food), and radar horns atop his head.

Viras

Viras's features include a spike-shaped head capable of piercing through a meter of steel, a brain with an IQ of 2500, organs for producing a force field and controlling the minds of others, tentacles that are 10,000 times stronger than an elephant's trunk and which can emit powerful beams for space travel, and organs to break down cell tissue and control metamorphosis (for creating its human disguise).

Jiger

Jiger's features include a pair of horns that shoot missiles made of hardened saliva and one that fires a deadly "magnetium" beam, powerful suction cups covering her entire body, an organ for shooting jets of seawater at 300 kilometers per hour, a stomach that can melt iron ore, and an ovipositor tail.

[Via: Tokusatsu Figure-kan]

These Ultra Monster illustrations by Toshio Okazaki are from 'The Return of Ultraman' sonosheet book (Volume 1) published by Elm in 1971.

Takkong, Ultraman, Twin Tail [+]

Zazahn, Sadora [+]

Kingsaurus III, Alien Zarab, Geronimon [+]

Jirass, MAT Arrow 1, MAT Arrow 2 [+]

Gorbagos, Suflan, Kiyla [+]

Keronia, Dada, Shugaron [+]

Mognezun, Kemular [+]

Seagoras, Seabozu, Dodongo [+]

Dorako, Ultraman, Gomora [+]

Skydon, Earthtron, MAT Arrow 2 [+]

Dangar, Gabora, Gyango, Alien Baltan [+]

Antlar, Pigmon, Gudon [+]

Pestar, Ultraman, Gabadon, Alien Zarab [+]

Detton, Zambolar, Telesdon [+]

Gamakujira, Stegon, MAT Vehicle, Kanegon [+]

Alien Mephilas, Hydra, Jamila, Ultraman [+]

Gesura, MAT Sub [+]

[More: Ultra Monster paintings by Toshio Okazaki]

A pair of action-packed Ultraman Monster paintings by Toshio Okazaki were published in Shōgakukan's 1979 edition of Ultra Kaiju (Shōgakukan Nyūmon Hyakka Series #97).

[+]

[+]

Alien Guts, Windam, Gyango, Black End, Kingsaurus III, Bemstar

Alien Icarus, Gomora, Muruchi, Alien Baltan, Alien Magma, Kemular

Dancan, Giradorus, Astromons

Gandar, Gabora, Alien Metron, Agira, Antlar, Seabozu, Woo

Gubira, Takkong, Pestar, Gamakujira, Bemular

Eleking, Alien Kuuru, King Joe, Zemistiar

Geronimon, Jirass, Alien Pegassa, Dino-Tank

Pegassa, Hydra, Black King, Mephilas, Verokron, Starbem Gyeron, Red King, Dorako, Godola

[Source: Ultra Kaiju (Shōgakukan Nyūmon Hyakka Series #97), 1979]