Massaranyan is a unique Yo-kai that after befriending it, the player can fully customize it using the in-game My Nyan app. Features that can be customized included its appearance, voice, tribe, name, skill, as well as its Soul Gem effect and Soultimate attacks.
Massaranyan starts off at Rank E once befriended and can increase its stats and rank after being trained by various Nyan Teachers unlocked throughout the game. It can also reset its stats and rank.
Massaranyan's initial appearance is similar to many of the other-nyan Yo-kai, however, its facial features mostly resemble Jibanyan's.
Using My Nyan, the following sections of the cat are available to customize: Ear shape, Face markings, Eye shape, Head accessory, Body markings, Tail, and Neck accessory.
The number of items available from the start is limited, however more are unlocked as the player unlocks them throughout the game.
The color of each item can be customized from one of 32 available colors. Some items have multiple parts that can be colored.