Makamou

In the fanfiction tokusatsu production Kamen Rider: Echo Demon, Makamou refers to an assortment of monstrous creatures that usually dwell in the rural areas & consumed human beings as food. In contrast to the humanoid adversaries in other Kamen Rider series, most of the Makamou are usually gigantic monsters of the kaiju genre whose designs & names are based on mythical creatures from Japanese folklores. Furthermore, the Makamou are aided by a mysterious pair of humans. The name Makamou can be translated as "Demonized Spirits of the Countryside".

Prince & Princess
The term used for a pair of Homunculi servants that aid a Makamou. Over time, it's revealed that they are actually a series of clones created by a couple, referred to as "The Man & Woman Who Live In The Western-Style House", thus making them the main villains of the series despite not appearing that often. They are powerful, though they prefer to evade rather than resort to fighting. In addition, it seems they're well educated & civilized. There's indication that they are humans from ancient times who achieved a means of immortality, due to the fact they use Shikigami like the Oni had in the past. Over time, they managed to blend into human society without any problem & because of it, they're able to conduct experiments to make Makamou even stronger to not only defeat the Oni, but destroy humanity. They also possess telepathic abilities, such as controlling their Homunculi clones, seeing them as mere puppets.

When Orochi occurred, the Man & Woman halted their actions & enlisted the Oni to help them, making their way to the marker of the sacred land to halt the Orochi. Their Super clones started to rebel, but retreated due to being the weaker ones. Though they overpowered their clones, The Man saw no reason to pursue due to their short lives, with The Woman feeling bad for them. A year after Orochi was stopped, they created Satori to abduct an ideal human (Minerva) so they use her to create more stable clones. In the end of the series, they are revealed to the clones of the "Real Man & Woman", who still need them to carry on their work.
 * "The Man" - The "Original" Prince, a youthful man dressed in a brown kimono & is seen wearing glasses. He is the one who creates the Makamou & the Prince/Princess clones.
 * "The Woman" - The "Original" Princess, resembling a young girl in a white kimono & carries a parasol.

Super Version
They are the newest & "perfected" version of the Prince & Princess, perfect copies of the "Man & Woman" with one minor difference: they need to eat a special Armor orb to prolong their lives. Originally, they had childish mentality upon birth with a slight incompetence & tend to goof-off now & then. They were first seen, eliminating the "outdated" Puppets, replacing them & the Parents. Soon after, the Supers serve to fight the Oni, lacking a battle-form with enhanced physical abilities & energy attacks making for it to let them battle the Oni hand-to-hand. In time, the Supers "mature" with a homicidal personalities to the point of being hostile towards each other & an obsessive desire to taste Oni blood. During Orochi, the Super Princess started to question their existence & their creators' intent, much to the Super Prince's annoyance. After being told to protect the Oni, Super Prince starts to question their masters as well & both begin to rebel against the "Man & Woman". This prove to be their undoing as they lose the method to prolong their short-lives & eventually dissolved at the same time Echo Demon ended Orochi.
 * Super Prince - He wears a red uniform. He originally acted like a dimwit until he finally matured, adapting a love for hurting things. He fights with a baton.
 * Super Princess - She wears a purple uniform & fights with a metal fan. She's the brains of the duo & the first to mentally mature & question their existence & their creators.

Puppet Version
Homunculi that act as field commanders to their weaker "siblings". They are able to create Parent Makamou & enhance the powers of the other Prince & Princess. Though mute, they are telepathic & are also controlled by the Man & Woman. They are then all destroyed by Super Prince & Princess after being created.
 * Black Puppet - Prince/Princess beings garbed in a black trenchcoat, given the task of creating the Giant Type Parent Makamou. The Black Puppet controlled by the Woman were given the Armor for use on the Parent Types.
 * White Puppet - Prince/Princess beings garbed in white robes, their task is creating the Summer Type Parent Makamou.

Parent Versions
The Prince/Princess servants that function as a Makamou's "parents", created by a special liquid from a Puppet's body & mixed with a certain object related to the Makamou. But these creations are imperfect as though they resemble their creators, the Princes bear the Woman's voice, whereas the Princesses speak in the Man's voice. But each Prince/Princess pair is different as they possess abilities based on their Makamou child; such as having crab claws & dragonfly wings. They can transform into Strengthen Prince & Spectral Princess respectively to enhance their fighting abilities tied to the Makamou they look after. Over time, few of the Prince/Princess pairs are fed a specialized orb, by the Black Puppet, which increases their powers & gives them Armored forms: Warrior Prince & Armored Princess. No more were created after the Puppets were exterminated.
 * Prince & Princess of Tsuchigumo: They were raising a Tschigumo, feeding it humans caught in their webs. While Prince was destroyed by Echo Demon's Demon Fire, Princess attempted to offer Josh to the Tsuchigumo, only to end being devoured by it.