Baraou no Souretsu

Very similar vibe as both series are set in different eras of the British History (Late Medieval vs Victorian), with their plot points based on actual past events (Jack The Ripper, Warwick's Rebellion, etc). Both protagonists are petite young boys with an aristocratic background, having contact with a demonic being (Joan of Arc, Sebastian), extremely vengeful, and are slowly consumed by darkness as the story progresses.  

- Anime adaptation of classic English literature (Shakespeare vs Sherlock) - Dark shoujo revamp featuring bishounen characters  

Lelouch and Richard III remind me of each other, in that each is an incredibly talented individual who eventually ends up in a position of great power or start in one, both of which consider themselves demons. 

its very similar to lady oscar, especially in the subject of the sexual identity in a context of a renascentist/ gothic era. Its very dramatic and passionatte so as heroic and misterous. The history unfolds around de Crown and being a king.  

- Anime adaptation of classic English literature (Shakespeare) - Dark shoujo - A story of getting revenge 

Both being based around suspense and dark storytelling as well as characters with different sides to them specially darker ones like the mc being troubled due his nature as well too and also nice art and character designs too. 

Both adaptations ruin the source material, Baraou no Souretsu being the worse one.  

Politics, blood, betrayal, war, love, and many different characters both do have