What I find great about this is that the classes match the characters!!!!! Think about it.

Sherlock and Medic:

1. Both do what they do for good (heal or solve crimes)
2. Both Crazy.
3. Both have a cloudy past.

Spy and Moriarty:

1. Both are masters of seduction.
2. Both masked (physically for spy but metaphorically for Moriarty for being such a secretive villain)
3. Both cause great chaos and pain to their enemies.
4. Both are calm and cool, even in danger.