It’s Headcanon Time Again.
It seems that there are more than a few folks on here who share my belief that Seto Kaiba isn’t just a paragon of card games and general snobbery, but also a deft hand at the piano.
He just kind of has that look.
But see, I’m starting to expand this belief. I think he learned because it was at least mildly cathartic, and also so that he wouldn’t completely forget his childhood. See, I think his mother played an instrument, too. Violin, specifically, but that’s not the point.
I think Seto learned to play her favorite pieces first, and then just kind of slowly expanded his repertoire.
I see him practicing every so often, after he gets home. I think there’s a nice grand piano in their front parlor. And sure, he’ll play your Moonlight Sonatas and your Für Elises and whatnot. Obviously. Maybe even an adaptation of Toccata and Fugue in D Minor because he’s dramatic that-a-way.
But then, just to see if anyone’s actually paying attention, he’ll belt out something a little more upbeat, and the Kaiba Estate’s house staff will just stare at each other, trying to figure out where the hell that came from. And then they hear Mokuba, up in his room, just start giggling fit to rupture something delicate.
Because he’s literally playing the Nyan Cat (A.K.A. Pop-Tart Cat) song.