Accelgor

Black +2: When its body dries out, it weakens. So, to prevent dehydration, it wraps itself in many layers of thin membrane.

White +2: Having removed its heavy shell, it becomes very light and can fight with ninja-like movements.

Black 2 / White 2: When its body dries out, it weakens. So it wraps a membrane around itself for protection while it spits poison.

Sword: It moves with blinding speed and lobs poison at foes. Featuring Accelgor as a main character is a surefire way to make a movie or comic popular.

Shield: Discarding its shell made it nimble. To keep itself from dehydrating, it wraps its body in bands of membrane.