A bakeneko is, in Japanese folklore, a cat with supernatural abilities akin to those of the fox or raccoon dog. A cat may become a bakeneko in a number of ways: it may reach a certain age, be kept for a certain number of years, grow to a certain size, or be allowed to keep a long tail. In the last case, the tail forks in two and the bakeneko is then called a nekomata. This superstition may have some connection to the breeding of the Japanese Bobtail.
Nekomata is a demon of the Beast Order an begins appearing in the latter area of St. Hermelin ???. They'll frequently use Candy Voice and Feral Claw as they attack the party.
Nekomata is the first Persona of the Hermit Arcana and can be summoned in the Velvet Room once Tatsuya Suou has reached Level 9 and collected 56 Hermit Arcana Tarot Cards. Upon being returned to the Velvet Room at MAX Rank, Nekomata yields the Kitty Claws weapon for Lisa Silverman.
"Incarnations of long-living cats in Japanese mythology. They can speak to humans and, depending on their power, can do various things. Some can turn into humans, while others can have the dead do their bidding."
—Shin Megami Tensei III: Nocturne Compendium
Nekomata can evolve into Senri upon reaching level 27.
"Incarnations of long-lived cats in Japanese mythology. They have various powers, including human speech and control over the dead."
—Persona 3 FES Compendium
Nekomata returns in Persona 3, but under the Magician Arcana, where she can be summoned once the Protagonist is at level 5. Her skill set specializes in Fire and Physical attacks as well as negative effects. You can obtain her by fusing Pixie and Apsaras.
"Long-lived cats are said to become these. They can speak human languages. Their powers vary according to how long they lived, ranging from shape-shifting to controlling the dead."
"Long-lived cats are said to become these. They can take the form of human women. When a pet cat lives for 50 years, it becomes a Nekomata. The name comes from its tail, which is split in two. They can speak human languages, and there are tales of them telling humans about themselves. The can stand on two feet and even dance."
The only Megaten games with an American release to portray the folkloric forked-tail are Persona 2: Innocent Sin, Persona 2: Eternal Punishment, Shin Megami Tensei Devil Summoner: Raidou Kuzunoha vs. The Soulless Army, and Shin Megami Tensei Devil Summoner 2: Raidou Kuzunoha vs. King Abaddon.