@Richard_Chilton: Well, that's close to right. But it has a few problems:
1. Mental skills cannot be raised by Beast Change.
2. The two forms will always be equally skilled by that method.
3. That method assumes that only one of the two will be relevant at any given time, which takes away a big part of the point.
4. That method doesn't let you give both characters different powers (at least not with any kind of efficiency).
@InferrumVeritas: Sounds interesting, but I don't really know how it would work. Can you provide an example?