Puck

Puck (パック, Pakku) is an Artificial Spirit in the Re:Zero universe created by Echidna that Emilia was formerly contracted with. He is known as the Beast of the End and is the current Great Spirit of Fire. In the world of Isekai Quartet, Puck serves one of the secondary characters in the series.

Appearance
In spirit form, Puck looks like a small gray and white cat. His left ear is pierced.

Personality
The small mischievous spirit that follows Emilia around. Giving her friendly advice, keeping her happy, and loves to play around. A happy easy-going fellow who doesn't mind the new situation of this world. Having fun with Emilia and the others.

Powers & Abilities
He is one of the most powerful spirits from his world, and is a master at creating attacks from ice. Capable of making a storm of them or just a giant one in general. Creating huge crystal he can use to attack or just freezing things. Back in his world, he killed Subaru by just looking at him.

Emilia
The long-lasting pact between Puck and Emilia extended from one world to another.

During Valentine's Day, Emilia thought about buying a gift for Puck.

During dodge ball, Puck helped enhancing Emilia's magical power before she threw the magic-powered ball at "Shield".

Subaru Natsuki
Prior to the events of Isekai Quartet, Puck and Subaru had a chummy relationship like buddies. Puck had determined Subaru's magic affinity and attempted to teach him magic.After ending up in the new world, Puck expressed curiosity, "But, you know. If Subaru does have some amazing secret talent, I would love to see it."

After Roswaal introduced Chomusuke as Class 2's transfer student, Puck was made an official student of Class 2 when Subaru held him out in display to the class.

When Megumin and Darkness sought Emilia and Subaru for help, Puck teasingly made fun of Subaru when the boy found the detention session scary, "Don't lie, I bet you're into that, you freak."

Tanya von Degurechaff
Puck worked with Tanya on her special training course to whip Kazuma into shape for field day.