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Since it's dual alignment enhancement, it depends on if you're playing it as a GE or an EE. If it's being played as a GE, then it would have to convert the EC to a hero, and vice versa if it's played as an EE (this is based upon the rule of opposite alignment relating to harm or negative effect). This is why the wording doesn't get specific as to what brigade or alignment the character is being converted to since it's a DAE.
The ability he posted does not specify that the target must be human...unless the ability he posted is not correct it could target Leviathan and convert it to a different evil brigade.