Aizo
Banned
As a whole? A few races left out here and there plus some deeper character development that's pretty rewarding. Fifth Stage ended with this last race just starting so the anime should pick back up with this race whenever Final Stage comes out.
I just wish the chapters would be released quicker. The last chapter in the series came out at the end of July and we're still 40+ away from it.
I've seen it all through Fifth Stage; I can imagine that character development is missing. Who has rewarding development?