Currently playing as a single-classed Chanter specialized in summoning. I hadn't tried it before because the long casting time of summoning spells seemed like a problem, but in truth, it's a pretty powerful build. Of course, the chanter doesn't get to do much during fights except summon creatures, but since you can control summoned creatures (and they often have special abilities), it's not boring.
In general, I consider the Chanter to be one of the most creative classes in the game. Sure, it's a bard, but it's extremely different from the traditional D&D bard. You never run out of invocations, the chants offer a lot of flexibility when it comes to buffs and debuffs, and the basic concept is pretty cool.
It's a pity that most of the other classes (aside from the Cipher) are much less imaginative. The Wizard is especially bad : it seems to come straight out of D&D, but with spells that are much less numerous and fun. Priests aren't that original, but at least they have some ties to the story and the history of the setting. Wizards could be removed entirely and nothing would be lost. Better yet : replace them with a class focused on the use of animancy.