its not letter wise, its name wise Isshu is simple natural, & has a ton of puns involved with it lol
Unova... its got nova, which is a large star about to,or has exploded at the end of its life, which is basically saying its supposed to be better& on top, which frankly the graphics are awful, the overworld camera is absolutely awful in places like Sky Arrow Bridge, & Huinn City, not to mention, the games are awfully pixelated for a DS game,not to mention the back sprites are absolutely horrible.
it looks worse than Heartgold&Soulsilver, the battle& pokemon improvements are the only good thing about Black&White (come fan boy&girls flame me, i welcome your blindness)
Nova is big, bright, explosive, most things with nova are amazing, exc. but Black&White graphically are a HUGE disappointment compared to Heartgold&Soulsilver.
on a gameplay note, its fontastic, which out weighs the horrible graphics i guess, but the 3rd version we will get in 1-3years has ALOT of graphical improvements to be made.
Isshu fits the region, its simplistic but still fontastic
Unova doesnt fit, its trying too hard to emphasize on 1 place, Huinn City, which is the only "spectacular" part of Isshu, i personally found everywhere EXCEPT Huinn City brilliant, the camera in Huinn just pisses me off.
same here, except i dunno if im jap or not :P
but i am studing the language :D