Let's Go To Gamma World. Meet... The Hoop.

Hoop  ("Floppsy")

No. Enc.:  1d20 (1d20)
Alignment:  Chaotic
Movement:  120' (40')
Armor Class:  6
Hit Dice:  12
Attacks:  1 (weapon)
Damage:  by weapon
Save:  L12
Morale:  9
Hoard Class:  VII, VIII
XP:  3,600

The militant, iron-willed hoops are 8'-9' tall leporoids with seemingly conflicting aesthetic sensibilities, as they favor Archaic gear and garb but covet Ancient artifacts and gizmos.

With but a touch, a hoop can transmute a metal item (and all its connected metallic parts, in up to a 3' "radius" of initial contact) into rubber.  [The Mutant Lord must determine on a case by case basis how this impacts armor, weaponry, robots, and the like.]

Hoops can make 40' standing leaps, and 20' vertical jumps, with ease.

Mutations:  Metaconcert, Neural Telepathy, Unique Mutation ("Rubber-Touch")

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Not-The-Designer's Notes:  The Hoop first appeared in 1978 in the 1st edition of Gamma World, by James M. Ward and Gary Jaquet, and again in the 2nd edition of Gamma World from 1983, by Ward, Jaquet, and David James Ritchie.  The solo illustration is by Larry Elmore from 2e, and the group shot  is by Dave Trampier from 1e.

Not-The-Designer's Notes Addendum:  There is no mention at all of Hoops being particularly "Chaotic" in alignment, but the classic depictions of them give this reader the jibblies.  So my versions are more ominous than perhaps originally intended.