Its just and idea and can be shaped. Actually all of them also can be an invidual guild. I mean lets say trade guilds are wealthy people but they need mass power. They go for power guilds and do alliance with them to defend their town or sth.
Another example, A missionare guild does agressive racist fights between other guilds or attack towns. But they are poor. They get secret finances from a trade guild and kinda..
Another example, an empirial guild that focus on peace and fight against missionares and gets a good deals with one or more trade guilds. So maybe these kind of guilds also try to control towns and territories and do some political movements.
In addition there maybe bandit guilds that attack people randomly. And they be deserted from other towns so they create a bandit town for themselves.. i just dont know many things can be happen so just imagine and say that why not..