Mewo, also known as Black Cat and Cat, is a character and NPC in Omori. She is known as Omori's pet cat and formerly Mari's pet cat in the Real World. Mewo is a black cat often found in White Space. She is usually shown sleeping, not doing that much other than informing Omori on how to escape White Space after he is teleported there upon Basil finding a photo. It is shown that she deeply cares for her owners. This extends to constantly attempting to comfort them in times of distress.