Arnes

A high-ranking demon who serves the evil god Wolbach. Appears in the spin-off "Give Explosions to This Wonderful World!".

A female demon with red hair, beast-like yellow eyes, horns, and wings. She has a voluptuous figure and wears revealing clothes, but when appearing in public, she wears a robe and hides her horns under a hood. She is somewhat high-handed towards humans but is relatively sincere and not incomprehensible. However, her loyalty to her master is very strong, which makes her somewhat emotional and unscrupulous when it involves her master.

While searching for her master, Wolbach, who had been unsealed near the Crimson Demon Village, she realizes that Chomusuke is actually Wolbach and tries to negotiate with Megumin to hand it over, but the intervention of the villagers muddles the situation. Furthermore, she ends up being falsely accused of the crimes of the "Explosion Mage" that Megumin had been committing.

Later, in Alcanretia, she encounters Megumin again and attempts to take Chomusuke by force but fails due to Zesta's interference. She and her subordinates then attack the carriage carrying the girls in another attempt to take Chomusuke but fail again and are defeated by explosion magic.