Minor characters in Higurashi no Naku Koro ni

Aiko Maebara
Aiko Maebara (前原 藍子) is Keiichi Maebara's mother. She rarely makes direct appearances in. In the anime, her face is never fully shown. Aiko is very fond of detective novels, especially those of Agatha Christie. She once wrote a crime novel and has contributed to a crime novel contest. She graduated from a "humble women's university". Aiko inadvertently helps Keiichi murder Teppei Houjou by revealing the trick to the "perfect crime".

Rena's father
Rena's father or Mr. Ryuuguu is a middle-aged man and Rena Ryuuguu's biological father. He was once married to Rena's mother after their meeting in Okinomiya. However, Rena's mother's flourishing career caused a rift to grow between the two. The family moved to Ibaraki for Rena's mother's job, forcing Rena's father to give up his own job and largely became a homemaker, though he wasn't very good at it. After Rena's mother revealed her infidelity, Rena's father fell into depression. After the divorce, Rena's father received a large sum of money as part of the divorce settlement, though he rarely spent any of it. His newfound wealth made him a target for con artists, specifically Teppei Houjou and Rina Mamiya. In, the two attempt to blackmail Rena's father via a badger game, though Rena kills Rina before the two can finish their plan. In, Teppei and Rina again attempt to blackmail Rena's father, however Rena talks to her father about the family's affairs and inspires him to find a job, avoiding the situation altogether.

Others

 * Daisuke, the second son of the grocery store. He likes shooting, and wants to be a sniper someday.
 * Keitaro, helped open Rika and Satoko's house in.
 * Makino, helped open Rika and Satoko's house in.
 * Takezou from the Makino tire shop. He likes Bonsai and Shakuhaci.
 * The two men who assault Keiichi in.

Akihito
Akihito (アキヒト) is the man Rena's mother left her husband for, first appearing in. Initially he was a friend from Rena's mother's work, however their relationship quickly escalated. After he impregnated Rena's mother, the two decided to marry and left both Rena and Rena's father. Neither Rena nor her father has seen Akihito since.

Akutagawa
Akutagawa (芥川) is a middle-aged man appearing exclusively in. He joins a suicide party traveling to Hinamizawa in June 2006. His reasons for committing suicide are unknown. On the drive towards the village, he details the events of the Great Hinamizawa Disaster to the rest of the party. He commits suicide via carbon monoxide poisoning.

Chiaki
Chiaki (千秋) is a woman appearing exclusively in. She joins a suicide party traveling to Hinamizawa in June 2006. Her reasons for committing suicide are unknown, though she hints that it is related to her husband's death. Her deceased husband left her with a large sum of money that she intends to bring with her to return to him after she died. She commits suicide via carbon monoxide poisoning. However, Akira Otobe steals Chiaki's cash card after the party commits suicide. At the end of Yoigoshi-hen, he returns the cash card to her body.

Machi
Machi (マチ) is a young woman appearing exclusively in. She joins a suicide party traveling to Hinamizawa in June 2006. Her reasons for committing suicide are unknown. Machi is drawn to Hinamizawa due to rumors that she could see the spirits of her dead family members there. She commits suicide via carbon monoxide poisoning.

Rena's mother
Rena's mother, also known as Mrs. Ryuuguu, is a successful businesswoman and Rena Ryuuguu's biological mother. She was once married to Rena's father after their meeting in Okinomiya. However, a series of promotions led her to spend more time at work than with her family. After the family moved to Ibaraki, Rena's mother became romantically involved with Akihito. She repeatedly brought Rena with her to office parties and similar affairs in an attempt to become grow her relationship with Rena while diminishing Rena's relationship with her father. She eventually tells Rena that she plans to marry Akihito and asks Rena to come with her. Rena strongly disapproved, and her disapproval turned to rage when Rena's mother revealed she was pregnant with Akihito's child. After this, Rena's mother refused to meet Rena's father and communicated only through her lawyer. Rena and her mother only met one more time, during which Rena attempted to give her mother a letter written by Rena's father, however Rena's mother refused to read it. After this, Rena destroyed all of her mother's possessions in the Ryuuguu house and vowed to have nothing to do with her ever again. Rena's mother has not appeared since.

Ryuunosuke Arakawa
Ryuunosuke Arakawa (荒川 龍ノ介) is a freelance writer that works for an occult magazine. Arakawa was perfectly happy to come to the village on assignment in spite of all the rumors. He is very well informed on the occult theories surrounding the village about aliens and parasites, but not as well informed on the traditional legends of the demons.

Arakawa tends to panic and overreact to things. He is highly suspicious of the other members of the group, especially "Sonozaki Mion" since, according to his information, she died in the explosion at the school. In the end, though, she is not only his best chance at finding material for his article but also his best chance at surviving. Not particularly brave, he will still usually come through in a pinch. He also has the most black and white moral viewpoint of the Yoigoshi-hen group, and is quick to judge and point fingers.

Saburou Sonozaki
Saburou Sonozaki is a member of the Sonozaki family working for the Prefectural Assembly.

Sawada
Sawada is Mamoru Akasaka's younger colleague and a member of the Japan Self Defense Forces. He, along with Akasaka, investigate the ruins of Hinamizawa 20 years after the Great Hinamizawa Disaster in the aftermath of Tsumihoroboshi-hen. He is originally known as simply "Akasaka's friend", he was given the name Sawada in the Higurashi no Naku Koro ni Kai anime. He is voiced by Katsuhiro Ota.

Section manager Takasugi
Part of the Okinomiya prefectural police.

Detective Kumagai
Part of the Okinomiya prefectural police. Waits in the command car during the raid on the Sonozaki residence.

Detective Komiyama
Part of the Okinomiya prefectural police. Leads group A during the raid on the Sonozaki residence.

Detective Atsushi
Part of the Okinomiya prefectural police. Leads group B during the raid on the Sonozaki residence.

Detective Bonchi
Part of the Okinomiya prefectural police. Observes the timetables during the raid on the Sonozaki residence.

Katsumi Tonegawa
Tonegawa works for the River Bureau's Urban River office at the Ministry of Construction. Tonegawa is represented with altered sprites for Kuraudo Ooishi.

Kazuya Arakawa
Arakawa works for the River Bureau's Urban River office at the Ministry of Construction. Arakawa is represented with altered sprites for Mamoru Akasaka.

Mitsuru Yoshimura
Yoshimura is a freelance writer investigating the curse of Oyashiro.

Daisuke Okano
Okano is represented with altered sprites for Tatsuyoshi Kasai.

Yuri Hoshino
Hoshino looks similar to Miyo Takano. In the visual novel, Hoshino is represented with altered sprites for Miyo Takano.

Hiroaki Nitta
Nitta is represented with altered sprites for Kyousuke Irie.

Kasumi Hotoda
Hotoda is represented with altered sprites for Rumiko Chie.

Teruhiko Oda
Oda is represented with altered sprites for Okonogi.