>>715378703(spoilers for recent, manga-only One Piece stuff if anyone cares)
there's been a ton of really weirdly coincidental ways recent One Piece has felt like it's mirrored some aspects of Deltarune beyond the latter just being so heavily on my brain lately, most of which is directly tied with this new character named Loki that, for example, was born with little devil horns and 'evil eyes' everyone hates him for and has him hide, and was treated so inhumanely that he utterly gave up on the entire concept on love from a very young age, all very Kris-like to me -- but beyond that, the latest chapter showed that despite feeling and being MADE to feel so alien and 'other' to his own people, he has sone thing going for him, one thing they treat him well about and respect him for, his pure royal blood. So whenever he sees his half-brother, technically also a prince, all he can do is lash out that he's a mud-blood and his mother's bloodline is filthy, and attacks him if he tries to confront him. The prince-hood and pure royal blood is *ALL* he has, the ONLY thing giving him ANY worth in this world, and anything that threatens to take even THAT away from him can go straight to hell..
I think that's Kris with the piano. Even if we suck, Kris doesn't want us to play it much, and when we're forced to do so for a longer stretch during the grand piano long song puzzle the lil dude spazzes out and "shows us how it's done".