Azlant is one of my favourite parts of the Golarion setting and so I absolutely love the idea of the Caligni. What classes/builds would you make with this race? They have odd attribute bonuses but I could see See in Darkness being quite powerful with the right build perhaps.
Most caligni adventurers become rogues and slayers, adopting the training of their dark creeper and dark stalker brethren. Some become alchemists, and the most depraved commune with the owbs as conjurers and summoners.
Maybe an Arcane Trickster, with the spell Deeper Darkness.
They are amazing martials due to their stat mods.
As such, they favor Barbarians, Monks, Fighters, etc.
See in Darkness makes them amazing Rogues and users of darkness spells in general.
One thing you should always do with a Caligni though is say their racial name with a very thick Italian accent.
I also recommend the chaokineticist. ^_^
I've found that the other Dark Folk castes actually make good starting points. Rogues and slayers (special mention to the Stygian Slayer) are excellent due to their naturally high skill points making up for the Int penalty and the physical bonuses being excellent, any non-Int based caster is decent (sorcerer, bard, and summoner are my favorite), and they actually make really good rangers, especially when going for a two-weapon or archery build.
they have perfect Kineticist ability scores; but ravingdork is right about chaokinetisist being the best because "basic Chaokinisis" allows them to avoid their light sensitivity.
I statted up a caligni spiritualist, because I liked the idea that her phantom is a distant ancestor (and spiritualists get protective pneunumbra) but I could definitely go for a chaokenetist, not only is basic chaokenisis perfect, they don't have to take additional wild talents to make the darkness/greater darkness talents useful. Your party will hate you if you spam greater darkness everywhere though.
I did an Owb Caller(Spiritualist)....have not had the chance to play them yet though....