One thing I would like to point out is that none of the main games have left Japan. The two GBA ones are Tales of-like knockoffs and the DS one is a semi-decent dungeon crawling ARPG (which is twice as good as Children of Mana which in of itself is only twice as good as From the Abyss which consists of basic RPGMaker level gameplay with literally nothing else going for it).
The main games though are SRPGs and have been floating around since the PSX days. And if I recall correctly, the closest thing we got to a Flight Plan (the former Summon Night developers) SRPG was Eternal Poison on the PS2 (which is a fairly decent SRPG that suffers from obfuscated mechanics and a rampant need to 100% every map to stay ahead of the curve (much like Covenant of the Plume does), which is made all the more difficult/annoying due to the obfuscated mechanics; at least the artwork and character designs don't suck like usual).
Also should point out that a while back some people on this board were raving about Dragon Shadow Spell which is another Flight Plan SRPG (and more apparently related to the Summon Night series with its awful character designs). Haven't played it myself but it might be worth looking into.
Also also, the character designs of these games are generally awful (generally speaking its like they take early 2000's era generic anime designs then take them the wrong way).