Deep Stalker Ranger looks fine to me, even if the Ranger itself is underwhelming.
Shadow Sorcerer, I like the concept but the Hound of Ill Omen though I feel doesn't scale with level when it should, though the disadvantage to the targets saves is useful. I also don't like the fact that it apparently has a separate initiative from the PC, that adds unnecessary complications in my opinion.
Undying Light Warlock, there's something I feel that's off with the concept, is that a Warlock has to feel like they're dealing with something sort of unpleasant or at least slightly menacing. This one needs a little more of an explanation on why it's spooky like the other Warlocks and those flaws I feel don't do enough. In fact they probably should have a patron entity in my opinion.