Shadeclan

Shadeclan was founded by Shadefur, a clan who's morals directly counter the other four.

While they do believe in their ancestors, Shadeclan's members are not loyal to Starclan, in fact most of them despise it and refuse to join after they pass, instead choosing to become wandering spirits.

Shadeclan is made up of former clan cats (mostly Thunderclan), rogues, loners, and former kittypets.

Shadeclan has it's own unique role, the 'helper' (also part-time helpers who are loners, kittypets etc. who do the same job as a normal helper in their free time, part-time helpers usually take on the night tasks). 

Helpers are cats who either cannot or do not wish to fight or hunt and instead do tasks given to them by their clanmates, these tasks can be anything from picking a pretty flower to completing multiple days worth of a cat's clan duties (some have tried to get around punishments by giving them to helpers, but they usually get caught pretty quickly) and other stuff like that. 

Of course, helpers have a choice which tasks they do, they hold meetings every morning where each helper is assigned specific tasks based on their skills and comfort. If a cat wants a specific helper to do a task, or wants it done secretly, they can request it face to face or via some form of message - most helpers feel uncomfortable by this as it is usually something shady like getting a poisonous plant or breaking up a relationship or spying on another cat etc.