If you're looking for similar to Fate/stay night: Unlimited Blade Works, you might like these titles. All recommendations are made by Anime-Planet users like you!
Japan's hottest service is Nicaea, a website that sends your friends a picture of your death before it happens. Daichi and Hibiki are two teens who didn't expect Nicaea to actually be real – that is, until the boys receive an email about their demise, and die shortly after. On the brink of going to the beyond they're given a choice: expire, or have a second chance at life. And so the two awaken to discover the city's been destroyed and they now have the ability to summon demons – an ability that a secretive branch of the government insists they use to help combat an imminent threat. For unless summoners like the teens put a stop to otherworldly invaders destroying the planet, the world will soon disappear...
So this may seem to be a slightly weird recommendation but here we go. Both of these anime contain elements of fantasy and action. The main character seems to at first apppear to be quite weak but becomes surprisingly powerful as the anime goes on. Also in Devil Survivor 2 the way they summon demons from another world is like how the masters summon their servants for the holy grail war. So I think if you enjoyed on you should enjoy the other.
Sakai Yuuji thought he was a normal high school student, until one fateful day when time stopped. Watching in horror, he witnesses a monster devouring the "frozen" people around him; but luckily for Yuuji, he is saved by a sword-wielding red-headed girl that calls herself a "Flame Haze". The girl informs him that he has been dead for some time now and that his current self is merely a replacement for the human that he used be while alive. He is, she says, merely a torch whose life will come to an end when the blue flame in his chest ceases to burn. After this rude awakening, Yuuji realizes that he is able to see the flames of life in other "torches"; and after discovering that a friend of his is also a torch -- and her life is burning out faster than his – he gains the courage to live out the rest of his life with meaning. Will Yuuji be able to find his place in the world before he ceases to exist?
So another strange recommendation but oh well. So the story in both of these anime involve a 'normal-ish' boy who gets caught up in magic and strange creatures from another world. Sometimes forcing the boy to fight, he also meets a mysterious girl in both who he grows his relationship with. They both have fantasy and action scenes. So if you enjoyed one you should check out the other.
Touma Kamijo's right hand has the ability to nullify any form of supernatural power, whether it be magical, psychic, or divine; he lives in a city populated by students with these powers. Yet unfortunately for Touma, his arm also seems to nullify good luck. Despite his bad luck, the boy tries to stay out of trouble and just live out his life, trying to be the "good guy" whenever he can; but trouble enters his life one day when he finds a young girl hanging on his balcony. She turns out to be a nun of the Church of England, bearing the Index-Librorum-Prohibitorum - a collection of 103,000 forbidden texts, and as a result has a number of people after her. How far will Touma go to protect his new companion from her pursuers?
So the reason based around this recommendation is the main character....Shirou in Fate/Stay Night and Touma in A certain Magical Index are quite similar. In the sense that both come across in the first place as weak and pretty powerless however throughout both series we see them grow not just to the people around them but their strenght grew. Plus the fantasy and very good animated fights are what brings the two together.
Sometimes daydreaming can get you into trouble, but what do you do when it's other people's dreams that you have to watch out for? Yumeji Fujiwara's has the unique ability to predict what kind of dreams other people will have. But lately, his own dreams have taken a bizarre turn in which he's being pursued by armies of cats. Stranger yet, Yumeji learns that the leader of the dream cats needs his body to access the Real World. And finally, the strange becomes downright weird when a beautiful girl suddenly drops on top of him and announces that she's a Dream Demon looking for a way back to the Dream World! The fabric that separates reality and fantasy is torn to shreds, and Yumeji has a lot of sleepless nights ahead of him as he has to deal with both the dream stalking and a dream walking!
Both of these series are about a boy who looks normal but as the series grows we see that it isn't what we think. Plus the aspect of controlling or be controlled seem to run through both stories. Also we see in Yumekui Merry how by joining with something not from your world can cause trouble for yourself, and cause dream-loss. Then a similar aspect is displayed in Fate/Stay night in the sense that the masters can get killed by forming a pact and joining in the war. Also action and fantasy elements are similar.
One night, Madoka has a terrible nightmare – against the backdrop of a desolate landscape, she watches a magical girl battle a terrifying creature, and lose. The next day, the teen's dream becomes reality when the girl – Homura – arrives at Mitakihara Middle School as a transfer student, mysteriously warning Madoka to stay just the way she is. But when she and her best friend Miki are pulled into a twisted illusion world and meet a magical creature named Kyubey, the pair discovers that magical girls are real, and what's more, they can choose to become one. All they must do is sign a contract with Kyubey and agree to fight witches that spread despair to the human world, and in return they will be granted a single wish. However, as Homura's omen suggests, there's far more to becoming a magical girl than Madoka and Miki realize...
These series are extremely dark and involve much more emotion and blood than some people will expect. Both anime have this dark element in Mahou Shoujo Madoka Magica the idea of secrets about magical girls and the fear of being killed. Then in Fate/Stay Night how you will have to kill others that may interfere with your plans. The whole idea of kill or be killed runs through both these series. Also fantasy and action are both clear in each series.