The first episode of a good shonen will typically have the main character SAY what the WANT and SHOW what they NEED.
Of course, a show that does that can still be bad and a show that doesn't do that can still be great.
The true sign of greatness is when the writer has intent and understands what their story decisions mean for the narrative.
But for some catchy advice the first post can be helpful for conceptualizing a new story.
Tatoeba.
In Chainsaw Man. Denji SAYS he wants to touch Boobs (great eye catch) but the story SHOWS that he wants to make connections with people.
The relationship between what's told and what's shown says a lot about the show and the character.
It reinforces that Denji is dumb and perverse but also that he's a pretty damaged guy who hasn't learned how to grow up yet or understand his own feelings.
It also shows the vibe the writer has with being very crass on the surface but has strong meaning in the foundation of the narrative.
Naruto says he WANTS to be Hokage but it's shown repeatedly he wants friends/family and to be respected.
Jujutsu Kaisen, Itadoris goal is to be able to decide the terms of his death, surrounded by the people important in his life. That kind of goal shows he's aware of his feelings and it says that the show has somewhat unconventional elements for a shonen.
Demon Slayer, Tanjirou simply wants to restore Nezuko. The show is simple for that but can very powerfully focus on a singular goal; the show is very simple but displays power scenes and moments.