Ghost Cat

Cat Monster (化け猫 Goblin Cat) is cat-transformed into created by  that first appeared in episode 14 of the 1972 tokusatsu series, Warrior of Love Rainbowman titled A Man's Promise.

Appearance
Cat Monster in his original form resembled an ordinary black cat, but upon being transformed into Cat Monster

Warrior of Love Rainbowman
Cat Monster was the pet cat owned by Iguana. After all of Iguana's monsters were killed, she then transformed her black cat into a monster known as Cat Monster. Cat Monster fought off Rainbowman and put up a tricky and difficult fight, as he was able to duplicate and dodge very quickly, however he was soon defeated by one of Rainbowman's techniques and reverted back into a regular black cat.

Duplication
Cat Monster can create false copies of himself to trick and confuse his enemies.

Sharp Nails
Cat Monster has very sharp nails that he could use for combat.

Hypnotism
Cat Monster can hypnotize others with his cat-like eyes. While doing this, his eyes will shine and glow brightly.

Enhanced Agility
Cat Monster had enhanced agility and could dodged all of Rainbowman's long-ranged attacks.

Trivia

 * Cat Monster is one of the few, if not the only kaijin that Rainbowman fights but doesn't kill; instead he just changes back into his true, original form; a black cat.