Illustrate an endearing Quokka adorned in a whimsical reaper costume, blending cuteness with a touch of the macabre. The Quokka, with its round, expressive eyes and friendly smile, is dressed in a miniature black cloak adorned with silver trim, reminiscent of the traditional garb of the Grim Reaper. A tiny scythe, polished to a gleaming silver sheen, is grasped delicately in one paw, adding a playful yet eerie touch to the ensemble. The Quokka's fur is soft and fluffy, a blend of sandy browns and creamy whites, enhancing its inherent charm and innocence. Against a backdrop of moonlit shadows and ethereal mist, the Quokka exudes a mischievous yet endearing aura, embodying a unique blend of sweetness and spookiness.