In the first couple of epsidoes Shindo and Birin would come to the aid of the other yokai. Birin would hold Bibyun back by grabing Bibyun's long scarf in its mouth giving Shindo time to teleport the wounded yokai to safety. However, they soon switched sides and started warning the heroes when ghosts were around.
Starting with episode 24 flaming arrows are fired at Bibyun, Bashaan and Zushiin. When they go to where the arrows seemed to come from they find Shindo and Birin, who deny firing the arrows.
Episode 1 Bikubeard (height 188cm, weight 96kg) - voice: Naya, Gorou
Episode 5 Kodamaan (height 197cm, weight 86kg)
Episode 7 Isuma (height 119cm, weight 94kg)
Episode 10 Bagdad (height 185cm, weight 115kg)
Episode 13 Haniwan (height 198cm, weight 135kg)
Episode 17 Kumonga
Episode 18 Kanedama
Episode 21 Fudema
Episodes 26-36: Demon
Emperor Gulliver (voice:
Demon Emperor Gulliver, leader of the Akuma Zoku (in Akumaizer 3) is also the ruler of the Yokai.
Episode 26 Nobusuma
Episode 30 Yoroi Bo [Armored Priest]
Episode 33 Kuruma Korogashi
Episode 35: Yokai from previous episodes brought back
Episode 36: Yokai from previous episodes brought back
the last episode the monsters were assisted by these ghost warriors
Romaji and translations by James Maruyama of Japan Hero
(using Japanese names I provided him.)