Sci-fi characters concept art

Work assignment for my university where I had to develop characters for a Sci-Fi story.
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Elts:
Laniakea, the supercluster of galaxies that contains the Milky Way, is totally dominated by the Elts, creatures never seen before. They make themselves known only through their destroyer ships, all of which are remotely controlled. The Elts communicate
telepathically with conquered worlds and enforce their laws through robots and droids.
Amendine Raj, a human warrior, is kidnapped and wakes up on a planet 480 million light years from Earth. There live the Elts
who, in reality, are but a single creature. It is she who directs the entire empire and, every thousand years, she gathers the most
brave warriors of the Universe for a great fight on the main planet: the warrior that wins will be the body of the creature Elts to
the next thousand years. Amendine, the chosen one of planet Earth, will have to survive this fight, in this hostile planet, where she
meets allies and make deadly enemies.
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Ci-Kay:
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A female of an ice-dwelling species, she can survive extreme negative temperatures without the need for
clothing. Ci-Kay is able to hibernate but, on the other hand, is able to move extremely fast, like a reptile. With
18 pointed teeth and a skull protected with a protruding bone layer, reminiscent of a helmet, Ci-Kay manages to
surprise opponents through its translucency (which give it a certain invisibility) and its gamma beam whip,
blue and deep-freezing. Ci-Kay is a naturally aggressive and solitary being.
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Bord-Alm:
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A heavy and tremendously strong creature, Bord-Alm fights with a huge proton hammer, capable of destroying everything and whatever its in front of him. Bord-Alm is a stubborn colossus with little ability to adapt to the unexpected. His eyes are deeply buried in a dense skull, prominent jaws and flared nostrils, Bord-Alm has the appearance of an angry bull with a feline soul.
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Turuptuc:
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A small and seemingly harmless being, obsessed with business, always hiding jewels or precious metals that
encounters, Turuptuc is selfish, incapable of understanding poetry or art. But he has an unexpected quality, when attacked (or when intends to attack), he instantly clones himself, managing to create hundreds of Turuptucs in a few seconds. His weapon (also cloneable) are small daggers made of emeralds and extremely sharp.
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M-340:
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A cyborg, whose original organic body is of the Armil species, naturally of weak physical constitution but
profoundly intelligent, who knew how to modify his body through technology, creating extensions and implants, made of incredibly resistant ultra-light alloys, which gives enormous longevity to the Armil creature but also to transform into a fearsome warrior. Armed with an atomic cannon and a powerful precision laser, the M-340 can fly and dive into deep waters. His attitude towards life and others is one of extreme indifference, as if life and death were just two sides of the same thing, two faces of an absolutely logical world.
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Amendine Raj:
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The daughter of a Norwegian father and an Indian mother, Amendine is a tall, athletic 30-year-old woman with dark skin and straight hair. Intelligent and insightful, Amandine has a cold temper in the face of difficulties. She specializes in wielding the spear of light, a staff that skillfully maneuvers to slash opponents.