fey warlock ninja

I'm making a archfey patron warlock for my upcoming campaign so I can fly about the map and use a lot of darkness or shadow of moil at higher levels to really make the most of the movement and obscurity in battle. I'm taking pact of the blade but dumping strength in favour of Dex to really fit that nimble in and out sorting it character I'm trying to make kinda basing him off the mortal Kombat ninjas like smoke and scorpion. I went for custom lineage and I'm sort of a Frankenstein guy put together on the brink of death I took the feat lucky and made a custom background "the fallen acolyte" and took the fest alert. anyone made a similar character or seen any videos or pages on forums of similar builds to help me decide what to take as I level up to help flavour the build? we'll be starting at lvl 1 but as you can tell I've already made some decisions for the direction of the character