Warning! Spoilers ahead for PPPPPP chapter 9!

A piano prodigy named Reijiro Otagami in PPPPPP struggled growing up in a family of legendary pianists similarly to what Shoto Todoroki experienced living with a powerful hero in My Hero Academia - but Reijiro suffered much more.

As the son of a world-renowned pianist, Reijiro was separated from other kids and only attended a conservatory for gifted musicians, as revealed in chapter 9 of PPPPPP by mangaka Mapollo 3. Reijiro grew up with his other brothers and sisters who were also piano prodigies, but they stayed in their own little world, leaving him alone. The only sibling he ever befriended, Lucky, was kicked out of the family for his failure as a musician, isolating him.

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Despite his seclusion, Reijiro, who can summon Attack on Titan-esque giants with music, soon made friends with a fellow pianist named Saiba Rindo and began experiencing a normal life. This all changed, however, when Saiba learned that the only time he won against Reijiro was because Reijiro let him. Saiba ignored Reijiro from then on and actually tried to hurt him by leaving razorblades in between piano keys. Tragically, Reijiro was aware of this and still tried to stay friends, strengthening his hands through exercises just in case he cut himself. All of this culminated in Saiba sabotaging one of Reijiro's concerts, leading to Saiba getting kicked out of the conservatory. Saiba was later told that his only friend could be the piano.

Shoto underwent a similar experience where his father, the hero Endeavor, separated him from his siblings so Shoto would have no distractions in learning how to wield his quirk. Endeavor believed Shoto was on a different level than his siblings and had to exist in a different world. Endeavor's unorthodox methodologies spawned from an obsession to sire a child with both his Hellflame quirk and his wife's ice quirk. As a result, Shoto was always alone, never able to interact with his brothers and sisters.

Some might argue that Shoto had it worse than Reijiro because he lost his brother Toya when Toya later assumed the criminal identity of Dabi after accidentally burning himself alive in an attempt to gain his father's attention that was only directed at Shoto. Conversely, Reijiro's brother Lucky doesn't become evil on account of their father's sins. However, Reijiro tragically adopts his father's cold mentality when he later reconnects with his beloved Lucky upon learning that Lucky still wants to pursue music even though he has no talent. In what's the most heartbreaking form of sibling rivalry, Reijiro takes it upon himself to crush Lucky's dreams to prove to Lucky that normal people can't become pianists. Shoto might have lost his brother because of something his father did, but Reijiro loses his own due to his own actions after being subjected to the warped ideals of his family for a prolonged period.

Moreover, Shoto's siblings actually wanted to play with him. They just couldn't because Endeavor wouldn't allow it. Meanwhile, Reijiro could have interacted with his brothers and sisters. They just chose not to. That, in and of itself, creates a more crushing sense of loneliness than the other ever could. Reijiro also voluntarily put himself in harm's way just so he could be with someone who not only didn't care about him but was the person who was actively trying to hurt him. So while Shoto Todoroki undoubtedly suffered from the isolation imposed upon him by his father to become stronger in My Hero Academia, the culmination of how Reijiro Otagami's seclusion manifests in PPPPPP to become the best possible pianist is more tragic. He and his siblings were given more of a choice but, because of their upbringing, chose what inevitably caused them and others to suffer more.

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