"Plush Wife" is Sushi Cat's Wife. It is an Pink Cat / Feline Plush, And Sushi Cat married it, An unoriginal thing in real life.
In Sushi Cat 1 Edit
In the first game's start, It is still not owned by Sushi Cat. Sushi Cat tries to buy it, But he fails to get in the doors. After getting money to the bus, He eats many sushi and wins a game to get the plush as a prize. He later marries it.