Makai Ouji: Devils and Realist

Both have the same elements: butlers , "bochan", bishonens, elegance, demons, contracts, fanservice with shonen ai background tones, even the fonts of the titles are almost alike, the same setting and feeling, with dark aura but with comedy very funny, the story in both are almost alike because of the contents. But I found Kuroshitsuji a little darker. 

-Both of the main characters are both rich and noble -Both main character have blond hair, sorta similar hairstyles, -Both main character has a servant -Both main character has a Demon partner -Both main character are special and has powers but doesn't realize it -Both settings of the anime are very similar, also gives off similar aura/sort of gothic aura -Both anime involves going into another unknown dimension -Both main character are stubborn -Both main character has no parents, except for pandora hearts, Oz has a father -Both involves contracts to summon the demons -Both you will enjoy deeply -Both really good By far, this is the most similar anime that can get  

-Both involve a guy protecting the main character -Both give off same aura and feeling into the anime -Both anime similar setting time of era -Both anime involves supernatural -Both anime involves main character has powers but they don't know -Both anime has action -Both are dark at times yet funny -Both really good 

-Both are similar era -Both give off similar feelings -Both involve magic and supernatural -Both anime involves magic and supernatural -Both anime involve main character(Aladdin & William) has powers and are strong/chosen one/special -Both main character are stubborn, sort of similar personalities (Alibaba & William) & look similar -Both revolves around Kings -Both really good 

Both are supernatural fantasy anime with some comedy. Both anime have bishounens surrounding the lead character. However, Makai Ouji's protagonist is a male while Kamigami no Asobi's is a female. 

- main character is protected by a lot of handsome and strong boys - set in a fancy school - both have demons and supernatural as the main theme of the story  

Both animé involves demons and the supernatural. The main characters have powers and skills that are yet to be mastered. They have the same dark but also light atmosphere, in Makai Ouji's case and in Ao no Exorcist, that has characters that relieve the tension. Both has its funny moments as well. Although William Twining is an elite who is born to a prestigious family and possess above average intelligence, Rin Okumura is the opposite. Both have an interesting plot that I would watch again and again, so I would definitely recommend if you like the concept of demons. 

Both are supernatural series with MCs who are reincarnations of important people with special powers, which consequently gets them dragged into a messy power struggle between good and evil. There are childhood friends who'll betray them, and unknown strangers who'll protect them - and in the end the MCs must choose whose side they want to be on. Additionally, both series have a cast full of cute bishounen guys with occasional shiptease if you're interested in that kind of thing - but at the same time, it's not too obnoxious.  

Both have an English Noble family feeling to it. Power struggle in Hell. Light comedy. Although the story lines are very different, if you are looking for anime with a similar atmosphere and feel to it, try out the other one. 

Makai Ouji and Natsume Yuujinchou are dissimilar in perhaps more ways than they are the same, but there is one striking similarity that I feel makes these two series connected. Differences: The vibes are completely different, as are the protagonists. Makai Ouji has a sort of ridiculous feeling to it, with characters so over the top as to seem unbelievable, as well as a protagonist who is centered around wholly unimportant things (such as his grades). Natsume however has very well rounded characters who in many ways lack the eccentricities of the characters in Makai, but are deep enough to seem real to the point of tangibility. Natsume also has an overarching slice-of-life feeling to it, which differs considerably from the shonen overtones of Makai Ouji. The art and music for both are very different too -- I personally prefer the softer palette and lines of Natsume Yuujincho, with its beautiful watercolor backgrounds, as well as its intriguing and extremely well suited instrumental music; whereas I didn't find Makai Ouji particularly enrapturing musically or visually. The supernatural background for both of these shows is also very different. One deals with very biblical mythologies (If you're familiar with judeo-christian mythology its funny to see the subversions present in Makai Ouji), and the other deals with more traditional Japanese shinto beliefs -- the idea of a 'god' is not present at all. The Similarity: The similarity lies in the main plot elements of both shows. Makai Ouji features a protagonist who is the descendent of Solomon, a great king of Israel who subjugated 72 demons, which has modern day (like, 1800s modern day) repercussions for his descendent/reincarnation William Twining. Because of Solomon's actions, William must deal with the constant incursion of many demons who want his political support, and one demon comes to his aid to protect him from the constant besiegement of these vying supernatural factions. Natsume is similar in that the protagonist, who has the unique ability to see spirits, finds himself the focus of many spirits' negative attention, as he has inherited his grandmother's 'book of friends'. Like Solomon, she subjugated many spirits and bound them to her, and Natsume must decide what to do with this powerful inheritance -- in this he is also helped by a strong spirit who protects him from the more malevolent ayakashi that seek the book of friends. These two anime are definitely more different than they are similar, but despite this they share a strong similarity in plot and the situation that both protagonists find themselves in. Despite this, the protagonists still are completely disparate personalities.  read more 

-The premise is quite similar - both have a human protagonist involved with demons - the ring of Solomon - the human is somehow special to the demons  

Both have pretty guys as main characters. Both are colorful and pretty. Both are sarcastic and funny. I think you will enjoy watching them.  

Animes with church themes, shonen-ai undertones and a stubborn, somehow childish, yet strong-willed protagonist. The comedy and drama blend is well done in both. Makai Ouji uses angels and demons while Hakkenden has youkai characters, but Christianism is present in some way. The stories are also similar in the sense that there's both a main story line ('Solomon's successor has born') and a main underlying motif, which would be Individuality and Death respectively for Makai Ouji and Hakkenden.  

Strong willed protagonist from an aristocratic family denies the existence magic despite quite obvious involvement with demons/witches. 

- Both have male leads - Shounen ai feeling - Male character protects other male character - Both of the male leads in No.6 are fighting against a government ( You can compare this to the angels in Devils and Realists) 

Lots of bishonen and with a lot of shounen-ai hints in both of the anime.Besides,both also about demons and power with the main protagonists often being protected. 

Lots of cute bishounen characters who are demons. All of them are brought together due to a certain event. The main character is linked to this event and must uncover the mystery behind it. There are yaoi like moments. Similar voice actors can be heard in both series.  

Stories involving Solomon's descendants. They also follow an easy monster-of-the-week format. 

-Both involve all men -Both main character has powers they do not know of yet -Both main character are stubborn -Both main character has somebody protecting them -Both seems darkish yet funny and happy at moments -Both involve magic/supernatural -Both really good 

-Both give off similar aura -Both has gothic background feeling -Both seem dark though at times funny and happy -Both involves Demons -Both really good 

This has nothing to do with demons but the style of animation is similar. One of the main characters goes to a prestigious school. The main cast from both series sing the opening and ending theme song too.  

A master serving their servant. They battle other people with similar powers 

A master serving their servant. They battle other people with similar powers 

Similar vibe with demons/shadow monsters and a choosen one. In Makai Ouji, William is the descendant of Solomon and must choose his elector. One who will serve and protect him. Since in the Makai world, demons are trying to kill him and prevent Solomon's revivlal. In Monochrome Factor, Akira must become a "shin"- a creature of the shadow world- in order to help restore the balance. There are BL moments here and there.  

Similarities: -Victorian Age/Fantasy -Dealing with abnormal spirits/monsters -Rich blond guy and dark haired partner by his side that helps protect him -Rich blond guy depends on partner throughout the story -Magic/Powers/Fighting -There is a character named Danitalian in both XD Differences: Devils and Realist: -Demons, Hell, and electing a substitute leader for Hell -Rich kid who's family has gone bankrupt -Surrounded by multiple friends/companions Danitalian -A really young looking girl who has magical capabilities of her own -Has a darker feeling, rather than Devil and Realist's upbeat and adventurous feeling -They act as detectives