The main cast
The main character which is the series centered around is Asta. He is a young boy who lives in an orphanage and aspires to become a magic knight and eventually become the Magic Emperor who guards the Clover Kingdom from any danger. Also by becoming the Magic Emperor he wants to get rid of discrimination against the common low folk.
But the only problem is, in this world where magic power is everything, he doesn't posses any magic, non whatsoever. Sounds familiar right. Many people compare him to Naruto (or even Midoriya) and are angry about it, which is understandable, but after a few chapters you will see the difference between the protagonists.
But now comes the interesting question; if Asta cannot use magic, how does he fight, or how does he even plan to become a magic knight. The answer lies in the finishing pages of chapter 1, where he acquires an absurd and awesome power that is the very counter to magic itself.
The deuteragonist of this series is Asta's childhood friend and rival, Yuno. He lives in the same orphanage, and like Asta he aspires to become the Magic Emperor. But, unlike Asta, Yuno is a genius and a prodigy in magic. Does this also sound familiar. Of course it does. The generic prodigy rival of the loser that is the main character. But unlike some shonen character of the same rival type, Yuno greatly respects Asta and considers him his best friend, brother and greatest rival.
The other characters
OK, now after comparing it to Naruto, comes the comparison to Fairy Tail. In the manga the characters are selected into certain magic knight orders each lead by a captain who is directly under the command of the Magic Emperor. Those magic orders can be considered as guilds cuz every order has their main HQ where they live.
After the hilarious and very funny knight selection exam, Asta manages to become a member of the magic knight order Black Bulls who are notorious for being the most vial and most crazy of all orders. On the other hand Yuno was selected into Golden Dawn, the strongest and most famous magic squad in Clover Kingdom.
And so after the selection, we get to know the other characters. I must say, I like every character that we got introduced to so far. Every character is very likable. There are all sorts of shonen types in those squads and all are done right. The most unique character for me, and my fav character in the series is the captain of the Black Bulls,
Yami. This man is freaking epic and badass and at the same time he is extremely funny and hilarious. He is probably the most badass and most funniest character in the series.
The world
The story is set in a fantasy medieval world. The main cast serve as magic knights of the Clover Kingdom. But there are also other kingdoms, like the military aggressive Diamond Kingdom, Spade Kingdom and so on …
As i mentioned, magic is everything in this world, so possessing more magical power gives you a higher status and more rights, while anyone with low magic power has lower status and is considered a slum rat. This also adds another interesting plot point of discrimination which is mentioned many times through the series and will surely be handled in the future.
In this world the main tool to become a magic knight is a magic tome or grimoire. Every year there is a ceremony in which certain grimoire select their user, kinda like the wands from Harry Potter. After the grimoire select you, you can become a magic knight and grow stronger as a mage. Every grimoire has one type of magic, and every time you learn a spell and progress in magic the grimoire grows. In the Clover Kingdom, on almost every Grimoire, a three-leaf clover symbol is inscribed, but there also exist the four-leaf clover grimore of legends which was possessed by the first magic emperor. The one who posses the four-leaf clover grimoire is destined with great power and luck, and to become the next magic emperor.
The fights
The nonstop action and fights are probably the thing Black Clover is most known for. The manga has really great fights, and every fight is really well choreographed. Team fights are more frequent in the series, but they are really awesome. There is no bs or major asspulls in the fights, and most importantly no silly one-shots against the main villains.
Overall
Great shonen series, with very likable characters, awesome fights, great comedy, emotional and epic moments, but of course with some cliche and generic shonen plot points, character motivations and goals. There are flaws in the series, i won't denie them, but if you love this type of manga you will overlook them very quickly.