Err... This creature before me
is definitely a cat, right?
Or would it be better to call it a plushie?
It has such cute eyes, I can't stop staring at it.
However, Mona denies having anything to do with cats.
Then why do I get the same thrill from this creature
that I get from seeing cute kitties?
—Vice

Code name Mona.
According to Mona, although Joker is the leader of the Thieves,
Mona is their self-proclaimed trump card.

Mona can transform into a vehicle and
aid other comrades' movement in battle.

Mona shared a room with Joker back in their world.
And calls the old dwelling Leblanc.

Mona and Joker once happened to be arrested at the same time.
The pair met by chance and established the Phantom Thieves of Hearts together.