Nibbles

Nibbles is a stray cat living in Megabuilding H10 who can potentially become V's pet in.

Background
Real animals in Night City are more than a rarity to behold. While cats were said to be the last to almost disappear, it is still possible to encounter them in a precious few locations. As of 2077, the Night City Environmental Task Force have been using stray cats to address the rat plague in Watson. Where these animals can be found, as was the case with Nibbles, it is clear that they are taken care of by the denizens of Night City, at least in terms of primary needs; however, it does appear that they remain technically unowned due to the absurdly extortionate pet taxes.

In 2077, V found a bowl in a corridor of Megabuilding H10 alongside a shard. If they decided to leave some cat food in it, upon returning after a while, Johnny Silverhand appears and comments after observing a cat eating from it. V is then able to interact with the cat, naming it "Nibbles", and taking the stray to their apartment, where Johnny and V observe it relaxing in a laundry basket. From that point on, Nibbles remains a resident in V's apartment.

Nibbles seems to have a delicate palate, as the aforementioned shard states that they only eats a prescript cat food made of tofu and tuna. To prepare it, one has to mash it up a bit and then put it in the microwave for exactly 17.5 seconds. If Nibbles refuses to eat it, then a little splash of NiCola should do the trick, although too much of the beverage can make her barf it right back up.

Nibbles, as a companion, remains in V's apartment at all times, where food, drink and a litter box are provided, with no need of further maintenance. Nibbles will meow for attention and change positions often; and may also interact with the iguana from time to time.

Nibbles can sometimes be seen drinking water from the shower base. If V decides to shower, Nibbles will hiss and growl and run away to another place.

During the Path of Glory epilogue, Nibbles will appear in the Afterlife.

Phantom Liberty
In The Tower ending it's revealed that they were adopted by Rogue Amendiares after V disappeared, and can be seen sitting on the counter behind Rogue in the message she leaves for V.

Acquisition
In order to obtain Nibbles as a pet, you'll need to first obtain Cat Food. It can be found in certain vendors or randomly within Night City, like the Arasaka Industrial Park or the Aldecaldos camp.

Some time after completing Playing for Time at the start of Act 2, the opportunity to adopt Nibbles will become available. You will need to venture left upon exiting V's apartment, follow the corridor, and then turn right. In a trash bin just around the corner, a shard titled "feed teh cat" can be found, and right below it will be an empty bowl. Interacting with the bowl will fill it with cat food. Leave the megabuilding, and return some time later.

After said time passes, upon returning to the bowl, Nibbles will be eating from it. If V interacts with Nibbles, they will be given the option to pick up the cat. From that point on, Nibbles will remain a permanent resident in the apartment.

Trivia

 * Nibbles is a reference to the cat of the same name encountered in The Witcher 3.
 * His appearance is that of a Sphynx, a hairless breed of cat, with the coloration of a Siamese.