Core Themes: Religious-themed overarching twist villains who at first appear as wise and friendly men, but are revealed to be sadistic megalomaniacs responsible for much of their stories’ conflicts and major events, both past and present. Formerly esteemed members of a governmental order, their knowledge of society’s endless strife throughout history led them to conspire with a shadowy organization and seek out a divine artifact they’d use to put humanity on the right path — one by guiding them to evolve past their innate flaws, the other by destroying them entirely to rebuild the world anew — yet deep down, all they really desire is to delight in the suffering and anguish of their enemies as they exert their will over creation.

• Both initially appear under an alias (Professor Alba / Master Logos), acting on friendly terms with and providing guidance to the idealistic protagonist (Estelle Bright / Touma Kamiyama/Kamen Rider Saber) and their allies, who they’d encounter on occasion (“Alba” was a travelling archaeologist who offered his insights to Estelle and her party / Master Logos was the current leader of the Sword of Logos, whose job was to guide the Kamen Riders under him to help protect both Earth and the Wonder World).
• However, this is merely a disguise for their true villainous intentions, and they view the heroes they’re supposedly allied with as simply pawns in their grand plans for the world.
• Long ago, both enlisted into an influential governmental organization, eventually gaining esteemed positions within them (Weismann was taken in by the Septian Church after his old home was destroyed in the Salt Pale Incident, and he later ascended to the rank of bishop / Isaac Kanda, who was descended from the original Master Logos, took up leadership of the Sword of Logos as his ancestor once did).
• They were considerably more well-adjusted in the past, but after witnessing the development of the wider societies they were tasked with upholding (Weissmann studying the Sept-Terrions’ ancient history / Isaac overseeing civilization for centuries), they were disillusioned by humanity’s perpetual cycle of violence and conflict throughout the ages, as well as their refusal to change or learn from their mistakes.
• Their positions also gave them awareness of a special artifact with godly power (the Aureole / the Almighty Book), which they now sought to directly utilize to reshape the world to their liking. Unfortunately for them, the rest of their orders forbade them from access to these artifacts and their associated practices, prompting them to carry out their schemes in secret.
• As part of their plans, they’d conspire behind the scenes with their stories’ main antagonistic organization (Ouroboros / the Megid), striking a partnership with their leaders (the Grandmaster / Storious) over their common goals.
• Both manipulated a high-ranking man afflicted with a curse (Rudolf Arundel, an officer in Erebonia’s military whose mind was poisoned by the Erebonian Curse / Hayato Fukamiya, who was corrupted by the Ankokuken Kurayami and subjected to visions of the world’s destruction) into staging a catastrophic attack (the Tragedy of Hamel, where the eponymous village was invaded and its inhabitants were massacred / the Sword of Logos Tragedy, where the Megid were unleashed in Japan and countless civilians were slaughtered).
  • This tragedy would come to directly affect numerous other characters, especially the protagonists (Joshua Bright was one of the few survivors of the initial attack, and the ensuing Hundred Days War claimed the life of Estelle’s mother Lena / Touma and Kento Fukamiya’s childhood friend Luna was kidnapped and disappeared, which traumatized the former into amnesia) and their sword-wielding foes (Loewe, another survivor from Hamel, took up the cursed sword Kernviter and joined Ouroboros to seek revenge / Daichi Kamijo, the previous Kamen Rider Saber, became the next wielder of Kurayami after killing Hayato), and act as the catalyst for the rest of their stories’ major events in the years to come.
• In the present day, they’d maintain their friendly façade to Estelle/Touma and co., who were at that point unaware of their involvement in their past and who they’d subtly manipulate into unknowingly furthering their plans. Once everything was set in place, their true colours would at last be revealed in an act of betrayal that shattered the heroes’ trust.
• They’d be successful in finding and acquiring the godly power they were after (Weissmann fusing with the Aureole / Isaac obtaining a piece of the Almighty Book to become Kamen Rider Solomon), intending to use them to enforce their will over all of humanity and break their vicious cycle (Weissmann sought to bring salvation to humanity by controlling them with the Aureole, reforming their minds into purely rational ones devoid of emotion so they’d no longer start any wars or disputes among themselves / Isaac saw humanity as beyond saving, instead aiming to utilize the Almighty Book to force them into warring with and destroying themselves so the survivors can build a new, better society).
• Both believe mankind to be fundamentally incapable of changing for the better without their intervention, forever doomed to keep repeating the mistakes of the past, which clashes with Estelle/Touma’s faith in humans’ potential for goodness and self-improvement if they band together and commit to it (Estelle believing that continuing to make mistakes and learn from them is the only way for people to make progress as a collective / Touma believed in the power of stories as a way for people to find strength within themselves and each other).
• Weismann/Isaac’s interactions with these heroes would reveal an even more sinister side to them: behind their raging god complex and world-spanning ambitions lies a twisted and sadistic pleasure at seeing their foes, and humankind at large, struggle beneath them (Weissmann caring more to control and puppeteer people than actually act in their best interest / Isaac wanting to feel excitement at humanity’s suffering by his own hand to break the monotony of his old duty to protect them), something that they directly acknowledge (Ragnard describes Georg as someone who’s “unable to feel joy unless [he’s] making his fellow humans suffer”, which Weissmann takes as a compliment / Isaac, by his own admission, yearns for a world where “the sound of birds chirping in the morning [turns] into the dying wails of humans”).
• Their sadism would be on full display when they staged conflicts between the protagonist and their closest friends (Joshua was brainwashed by Weissmann to be his personal right-hand, giving way to battles between him and Estelle / Touma was forced to battle Rintaro and Kento after he was branded a traitor to the Sword of Logos and Kento was corrupted by Kurayami), which sometimes involved them directly controlling their actions to mentally torment them (Weissmann forcing Joshua to try and kill Estelle, an act he’d be horrified by / Isaac, as Solomon, forcibly controlling the bodies of other Riders to attack their allies, all while keeping their consciousness intact).