Calico Cat

Calico Cat is currently the only known pet or animal that is from the real world. He is also one of the creatures who does not have a human form while the rest of the beasts like Galdo Gasper could take two forms.

Background
Calico Cat is the companion of Yō Kasukabe, often accompanying her. He is able to speak with Yō thanks to her Gift that allows her to speak with animals. Calico Cat is also able to speak with any creature of the cat persuasion. He does not have a nickname and is solely referred to as "Calico Cat".

In volume 4 it is revealed he could talk to Yō's father, Koumei Kasukabe.

Appearance
Calico Cat, as his name suggests, is a calico-breed feline. He has a mostly-white body, with a brown-orange back. His left ear is brown and his right orange. He has green eyes and a brown-striped orange tail with a white tip. He is fluffy and doesn't wear a collar.

Personality
Calico Cat is assumed to have a slightly sassy personality. This is further evidenced when he attempts to smooth-talk with a cat-persuasion waitress.

Relationships
Yo Kasukabe

He is the main companion of Yō Kasukabe.

Kyaroro Gundark 

At the end of the story, Episode 10 - It Seems That the Problem Children Prove Who's On Top?, it was shown that Calico and Kyaroro have some sort of a relationship, shown by sharing and orange juice drink.

Sakamaki Izayoi

He is the one who stole izayoi's Headphones.

Plot
Calico Cat was the one who picked up the letter that fell from the heavens and brought it to Yo Kasukabe excitedly.