Kazuma Satou. An adventurer of the weakest class. He lived as a shut-in NEET in Japan before being reincarnated into the KonoSuba world. Since he chose to bring Aqua as his one item to the other world, he has no cheat abilities. Jack-of-all-trades and cunning, but actually cares for his comrades. Leader of Kazuma's party. He carries a katana named Chunchunmaru (named by Megumin).

A Goddess of Water who used to guide those who died young, but was dragged to the other world by Kazuma. She loves alcohol and is incredibly selfish. An Archpriest who masters the highest level of recovery magic. Member of Kazuma's party.

A girl of the Crimson Demon Clan boasting high intelligence and magic power. Her hobby is Explosion magic, and she specializes in it (in fact, she can only use Explosion magic). She often speaks politely. She is self-conscious about her childish physique. An Archwizard who wields the strongest magic. She is accompanied by a black cat named Chomusuke (who is actually an evil god, though no one knows). Member of Kazuma's party.

Born into the high noble Dustiness family. Real name: Lalatina Ford Dustiness. Female. A massive masochist. Possesses the highest defensive power. Her class is Crusader. Her attacks never hit. Blonde hair and blue eyes. Member of Kazuma's party.

A girl of the Crimson Demon Clan, same as Megumin. Unusually calm for a Crimson Demon, but can be quite short-tempered. A lonely girl. Self-proclaimed rival to Megumin. Wields advanced magic. An Archwizard. Not used to talking to others. Daughter of the Crimson Demon Clan chief.

Kyouya Mitsurugi. A handsome young man with a strong sense of justice. A Japanese person who was reincarnated into the KonoSuba world with the cheat weapon Cursed Sword Gram. He calls Aqua "Goddess-sama" and Kazuma "Satou." A Swordmaster, the strongest class of swordsman. People never remember his name. He is accompanied by two female companions, Clemea and Fio. He is loathed by Kazuma's party. He himself does not like Kazuma either.

A Lich. Famous as a former highly skilled Archwizard. A beautiful woman with very pale skin. Currently the owner of the Wiz Magic Item Shop in a back alley of Axel, running the poverty-stricken shop with the masked Archdevil Vanir.

A silver-haired girl. Sometimes mistaken for a boy because of her slender build. A Thief. Has a frank and cheerful personality. Her true identity is the earthly form of Eris, the Goddess of Fortune, but this is a secret shared only with Kazuma. Darkness's friend. First person: I (Atashi).

The first princess of the Kingdom of Belzerg, where Kazuma and the others were reincarnated. She calls Kazuma "Onii-sama" (Big Brother) and they are on good terms.

A masked devil. An Archduke of Hell. Possesses the "All-Seeing Eye" to read the past, future, and emotions of others, along with other cheat-level powers. He retired as a general of the Demon King's Army and now lives with Wiz. Often fights with Aqua. He uses archaic speech patterns, referring to others as "Thou." He is exasperated by Wiz, who constantly falls into poverty. The mask is his true body. He was defeated by Kazuma's party during his time as a general but resurrected by consuming a "life," and now helps out at the Wiz Magic Item Shop.