This is what the 4 Processors will look like for the most part. They wear long cloaks so as to hide their identies and features, but besides that they each look different and most have some sort of an alchemical tattoo on their bodies, not the Ouroboros or a transmutation circle, but one that symbolizes their process along with their own personal skills, I'll try and provide pics of the tattoos if possible. As they come into the story I will provide a detailed character sheet as well, but for now if you wanted, before they are actually brought in, you may glimpse someone dressed like this during some events and such.
The 4 Alchemical ProcessesDecomposition: dissolve, rot, rust, and other such things are simple abilities to the holder of this process. They can use a simple form of alchemy to break apart substances in a variety of ways without having to actually use anything but alchemy, meaning they could cause a persons arm to begin to rot with a touch, or cause a hole to rust through metal just as easily
Modification: the abilities of modification allow one to change the state of a substance without the use of alchemy, meaning one could turn mercury solid without having to freeze it, however this does not mean the substance will remain purely what it was before. Sometimes something must be changed about the substance to do this, something added
Seperation: being able to completely break something down into each and every individual part, for instance, turning water into pure hydrogen and oxygen, or breaking down a brick wall into the individual substances of the brick itself and the mortor holding it together, then going even further to break it down nearly on an atomic level
Union: combining any substances to create one thing from them. With the abilties granted by the process of union one could combine oil and water in such a way that they could never seperate again
These abilties will be better demonstrated through the rp, I hope. The Processors have regular alchemy abilities, which require transmutation circles, knowledge, and all such normal things, but when it comes to their personal process they need nothing but to be able to touch something to preform the skill.