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Plastic.
As in rubber-like, having no solid form, being able to stretch and change shape.
Including being able to wrap around an opponent or slam them with elastic limbs.
Regenerating from physical hits.
In a way, an opposite to the concept behind Steel.
Steel is the ultimate defensive type, taking physical hits by sheer hardness.
Plastic is the opposite, it has no fixed shape and absorbs physical hits by deforming and then returning to its original shape.