Deset Gled said:To balance something with a negative LA, I think you would need to have at least four or five racial hit dice to start off with. A 2HD monster with a -2 LA seems like a bad idea, but a 4HD moster with a -1 LA sounds like it could be balanced with the proper penalties.
Given that 1HD monsters trade out their racial HD for a class level, and that 2HD with -2LA is next to impossible to balance, I would say that any combination where -LA is <= 0.5*HD is probably balancable.