This is a little sketchbook-page of a few of the monsters used by the Martian Invasion-Force: Dairusukai. They are split up into three main types.

Martian-Warrior Unit:
These are the group's highly-trained warriors.
Za-Taiku: An insectoid swordsmen who believes in winning at any cost.
Za-Soriruka: A manticore-like Martian-Warrior with venomous-pincers and a sting.

Martian-Beast Unit:
These are wild, Martian beasts that infest all over Mars.
Da-Doruki: An insect-like dog with razor-sharp claws and venomous fangs.
Da-Chirokita:These are small germ-like Martian-Beasts that can infect any machine.
Da-Pokiruku: A human-sized breed of the Da-Chirokita that feeds on humans.

Martian-Machine Unit:
These are the group mechanized war-machines, made up of both giant-robots and advanced super-weapons.
Godomchiro: A giant humanoid battle-robot with a giant-claw and plasma-cannon.
Torukuta: A giant machine that controls the weather and causes earthquakes with it's drill.