The main character doesn't have something that everyone else has, being super powers or magic until hope appears.
Both are Shounen Jump series.
These two series both share a certain type of protagonist.
Deku and Asta are bot underdogs at the beginning of the series and need to work their way up in the world using more effort then everybody else does in order to stay relevant in a world where the extraordinary has become ordinary.
Weak but ambitious main character on his way to reach the top and proving himself to the ones who doubted and wronged him. Main focus on his journey to power up, finding friends and rivalry.
(Action, Fantasy, Superpower, Shounen, Comedy)
Shared ideals and humor, with black clover having a slightly darker side. Dark as in separation of classes.
Both main protagonists are people without powers/magic in a world where powers/magic are essential and common
After a while both of them find a way to get powers/magic in order to one day make their dreams come true: be like All Might/ be emperor of magicians
Both mc's are born with no powers (Magic or a Quick)
They are underdogs who wish to be someone well known.
They both gain a massive amount of power.
-Both are The New Generation of Classic Shonen Nekketsu
-Both stories have a protagonist with no talent but immense raw power.
-Both protagonists have unbelievably high goals
Both shounens focus on a specific protagonist who is void of power in a world where everyone naturally has power. It is through fortunate events that said protagonist gains a special unique power as they set to pursue their dream
Both series have a protagonist who starts off powerless but then gets the strongest power of them all and uses that newly gained power to try to achieve his goal of becoming the very best.
Both MC didn't have special power at first even though people around them have special power
Both MC have awesome mentor
Each of the two animes have protagonists in which they start as a "loser" to the world where they live. Asta (Black Clover) wasn't born with magic on a world where magic is everything and Deku (My hero academia) was born quirkless which is what gives super-powers to 80% of the world's population. The only major diference is that one passes in medieval fantasy times and the other one is modern times with super-heroes.
Deku(bnha) and Asta(bc) both are at disadvantages in the world they are in:
both lacking the powers (Quirks(bnha) and magic(bc)) that everyone around them see as normal things for everyone to have.
Both of them want to be the "number one" in their world, and both look up to the current number one (All might(bnha) and The wizard king(bc)), to do so in which they NEED those things that they lack.
There are more similarities but i dont wanna spoil everything.
Honestly, these animes are so similar in the basic plot, but each have their own way of making them unique. Both are amazing animes