This creature resembles an insect or crustacean. It is mainly orange in color. Its most distinguishing feature is its enormous shell, which resembles a cut-away block of sediment with multiple layers and strata visible. The tips of its pincers and six feet are dark gray. It has two glaring yellow eyes. Its Dream World art shows dark red body segments, instead of orange.
Gender differences
None.
Special abilities
It is very strong, to the point that it can carry heavy rocks for a long time.
Behavior
Crustle fight each other over territory. These battles can become very vicious. If a Crustle's shell breaks during such a fight, it loses.
Crustle is based on a hermit crab. Its shell resembles a block of stratum rather than an actual shell, though the design also seems to resemble ornately-colored hermit crab shells.
Name origin
Crustle is likely some sort of combination of crust, crumble, rustle, and/or castle. Crustle may also come from crustacean, which is what it appears to be. Iwaparesu may come from 岩 Iwa, rock and パレス paresu, palace, or プレス, press.