Arc 1: The Tumultuous First Day

Who is this?

You can usually tell the importance of a character based on if I could find a PNG of them

You can especially tell the importance of a character based on if I could find a high quality image of them

Arc 2: The Turbulent Week

Witchbeasts are alternatively known as Mabeasts or Demon Beasts

Bonus: What is the name of this Witchbeast?

Arc 3: Return to the Royal Capital

His last name can also be translated as "Euclius"

Sometimes translated as "Rye Batenkaitos"

Arc 4: The Everlasting Contract

Also known as "Petelgeuse Romanée-Conti"

Yes, EVERY named character with a picture

This goes quiz goes through most characters in Re: Zero -Starting Life in Another World-, starting with Arc 1 and progressing to Arc 10, then the OVAS, then the EX novels, then the Tanpenshuu volumes, then IF routes, and finally, the games.

(*Each character must have an illustration and name to be included)