Dont forget that you can only have 2 extra passives aside from the ones given from their primary class. Yates special class, Spymaster gives him the Shadowstep teleport that the Vampire Badge would give someone else through Bat form, and the Lords equip anything ability.

This combined with Warmage, and Duel wield already lets him attack for large damage from nearly anywhere on the map using guns. (I use rapiers on him because thats his cover art weapon)

He already has a huge advantage over say picking Lord, or picking Vampire as their primary class, as if you want something similar to yates, you'll have to have 1 of the passives you can equip as either bat form, or equip all, and the other one dual wield. Yates has both those options on his primary class, and has 1 free passive slot to help him in combat, such as Know Weakness or Versitile.

All the Special Character Classes have some unique combination of passives that you cannot get through badge classes. The Anotomist is one that is entirely unique, iirc.

Hopefully this helps you ^{^}