This MAY have some spoilers.

This WILL truly be one of the most influential shows ever, NOT just in its characters, animation, and story, but the message the show gives is EXTREMELY influential and can be very motivational.

Let's start with the thing that's the most exciting, the animation:

Doga Kobo LITERALLY put all of their budget into this masterclass of animation, unlike their other works.

And its brilliant too, a perfect mix of Mengo's and Aka's vision put into anime form, ESPECIALLY the eyes and irises of ALL of the characters, and even when the characters are just talking, this show has something unique to put in their personalities

The influence it had on the real world is basically Demon Slayer levels, and that's the case all because of the animation department, it is awesome to see Doga Kobo stepping up in their quality.

Every single scene just oozes out the word "eyegasm" and it GREATLY enhances all of the characters in their personalities and interests.

I cannot stress enough, just look at them.

Anyway, Let's just talk about the characters for a moment since that's the aspect that's also AMAZING:

Going into Oshi No Ko, while liking Kaguya-sama: Love is War and disliking Scum's Wish, I didn't really expect much, but TO MY SURPRISE, the characters are also great and distinct in their personalities.

Ai Hoshino: while only appearing for ONE episode, she has an amazing backstory and a lot of character development with an increased runtime to boot (82 minutes), this made her death SIGNIFICANTLY more impactful and is a turning point for the reincarnated twins moving on, the show isn't afraid in biting its nails and scratching its knees in fear of people will be bored of the runtime, and it worked SPECTACULARLY.

Aquamarine Hoshino: While quite emotionless all because of Ai's death, he is quite the sploingus, He's BRUTALLY honest towards people, with a understandable goal of seeking revenge for his dead mother, He's MUCH more prevalent in episodes 2 to first half of episode 9, and that really is reflected by the people he meets, helped, and even made friends with along the way.
(one small complaint is that I wish he had a bit more emotion aside from acting)

Ruby Hoshino: Much less screen-time than I expected, but she still works because of the First Concert Arc happening at the second half of episode 9 to the first half of episode 11, and THAT motivation of becoming an Idol really sells her character, and becomes actually important.

The first character the main 2 get to meet is Kana Arima, once was a well-known child actress, while quite stubborn, that greatly makes up because when she meets Aqua, she now has somebody that genuinely admires her, while initially feeling a sense of envy, the Sweet Today arc was definitely a great watch and helped developed Kana as a character.

Next is Akane Kurokawa, introduced in the reality dating show arc, she's actually based off a real person, and that ADDS to the realism of the situation she faces, after the accidental scratch, she had a BIG turnaround, her character is at her best during episode 6-8, where she has a work relationship with Aqua that is also a message to the real world, that scene in episode 6 HITS hard, and it's a great message of "You are not alone".

Next is MEM-cho, She's usually quite goofy and overall quite silly, doesn't have MUCH character development outside of episode 11, but she isn't a badly-written character either, when Aqua tells her that there is now a chance for her to become an Idol, her character changed, and i like that.

Pieyon is a fun and exciting mentor when he is around.

The rest of the other characters are also quite charming and does help the main characters a lot.

The story is not unique, but still great overall:

Every few episodes, a new event is about to start (like a show, a performance), and time and time again, and it shows the struggles and what it TRULY means to be an actor or singer.

The pacing usually flows at a natural pace, although i do wish The First Concert Arc's storyline was extended a little bit further, since there are little screen time for Ruby.

Overall, a flawless show, with amazing relatability, and some dark and lighthearted themes that match with the tone of the show and story, and gives a representation of what it means to be an Idol or Actor.