I am not an expert in the game but here are some examples of new Illuvials that have occurred to me in the shower:
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Spider: in omega it attacks with each leg to a different flank. It can attack in front with the front legs, to the sides and back (to defend the rogues) at the same time.
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Kangaroo: in omega, 1-2 extra (small) marsupials come out of its pouch that will move autonomously from then on. At each omega, accumulate units (kangaroos with boxing gloves?).
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Pufferfish: it starts small but in omega it gets bigger and bigger and more powerful.
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Peacock: in omega it unfolds its tail and blocks all the weapons that will pass through it, both weapons shots, psion shots, as well as units that move across the board.
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Parrot: in omega it imitates the last omega it has received and can even absorb the enemy's classes and affinities.