As you know, the name "Sora" translates as "sky", the name "Yozora" as "Night sky", and regarding "Roxas", I heard somewhere that in Spanish there is a name similar to" Roxas",. and translates as" Red sky " (Red sky ,usually always associated with twilight.) Also interesting is the place where the heroes live Sora lives in a place where it is almost always day, sunny and light "Desteny Islands", Roxas lives in a Twilight town, in a world where it is always twilight. And Yozora resides in Quadratrum ,a world where it is mostly night. And it's also related to the nature of the characters. Sora is a completely positive hero who fights for the light, Roxas has been on both sides for his existence. Yes, and his clothes have a black and white motif, even Nomura himself said that it should associate light and darkness. And Roxas itself is quite volatile. Regarding Yozora, there is little that can be said about him at the moment, but he seems to be on the dark side at the moment, or at least, more correctly, someone is manipulating him. Well, by nature, Yozora is more antagonistic and hostile from what we see. Maybe it's just a small thing. But I found it interesting and I hope in the future that it will somehow beat.

i dont see why its funny

surely its just KH being KH

Edited February 5, 20214 yr by ocean's rage

Well this is more intentional if anything. Sora's name translating to sky is something that's generally well known, it was meant to mirror Riku translating to land, and Kairi translating to sea/ocean.

As for Roxas I can see where you're getting the red theme from, but I'm not sure if that's what they were going for, as much as the name just being an anagram for Sora. In Spanish rojo/roja is the word for red, and x and j can be pronounced the same (hard "h" sound). There's no clue in the name itself  circling back to sky though. 

Yozora being night sky, I feel is both to serve as a foil to Sora, and also with the heavy FFXV vibes probably meant to mirror Noctis's name as well. 

I agree with you on the worlds they're from mirroring their personalities though.  Not sure I would group them all as a trio based on this though.

yozora's name is one of the many things that make him so curious 

Edited February 5, 20214 yr by ocean's rage