I know the show is aimed at a younger audience, and that probably reflects the good rating of over 80%, but sorry, I would have liked a bit more depth.

Where to start. The main character Asta is practically another version of Naruto. Loud, can (still) do almost nothing and wants to become Hokage/Wizard King because he has his heart set on it...
and Yuno is practically Sasuke. Quiet, prodigy and a tendency towards evil?

Even the first mission of Asta is against villains who fight with ice and mist and reminds a bit of the mission with Zabuza from Hidden Mist Village.

The protagonists of the BlackBull gang are so flat in character, you could cut them out (at least in the first 14 episodes I've watched so far) and you wouldn't notice any difference.

An emo who is shy and quiet.
A semi-strong punk who always talks about what it means to be a man.
An alcoholic who walks around in her underwear and her only pastime is drinking alcohol.
A glutton who does nothing but eat.
A creepy fat guy who probably has a very soft core.
A paedophile who gets nosebleeds every time he imagines his sister naked?
A womaniser, a short guy who always wants to fight and says practically nothing else (Probably later it will turn out that this guy is really strong...)
and a boss who smashes walls all the time to get his point across.

In fact, there's nothing wrong with these character traits, but the characters ALWAYS do and say the same things. No variety, no depth, just clichés.