Mega Lord (height 203cm, weight 96kg)
Evil and Gabura switch sides, joining with Zabitan to form the Akumazier 3. Darunia is in love with Zabitan so she changes sides too.
Episodes 03 & 04 - Red Nida (height 203cm, weight 96kg) & Blue Nida (height 198cm, weight 97kg)
Episode 05 - Siren (height 178cm, weight 89kg)
Episode 09 - Hagenegon & Majouruka
Episode 13 - Tokei Man
Episode 16 - Kasadora
Episode 20 - Doracuda
Episode 23 - Okamida
Nobera and Nobera, Jr return in episodes 37-38, to join the Akumazier 3 in fighting the Demon Clan.
Episode 26 - Namazon
Episode 28 - OniTengu
Episode 31 - Gorgon (no photo)
NaameNaameda (who loves Darunia) returns in episodes 37 & 38, to fight against the Demon Clan.
Episode 35 - Musasabida
Episodes 37 & 38 - Basugaru
Basugaru is the only Demon not to fight against the Akumaizer 3, instead he joins NaameNaameda, Nobera and Nobera Jr in forming "The Demon Party of Peace" (Heiwa Tou Yonin Jyu) which joins the Akumaizer 3 in defending humanity against the Demon Clan.
Episodes 37 &
38 - Geberu
In episode 37 it is revealed that Mega Lord is not the true leader of the Demon Clan, but follows the commands of the mysterious Demon Emperor Gulliver who hides his true appearance behind a screen of glowing lights. His true form won't be revealed until episode 24 of Ch˘jin Bibyun. The Demon Emperor sends his greatest warrior, Geberu, to defeat the Akumaizer 3.
Every episode - Aguma
These soliders of the Demon Clan assisted the monsters.