IMO:
Night Crawler: A blue race with 2 fingers and toes, and tail. Their origin is unknown, but rumors suggest they are some combination of elf, changeling, and theiflings. Often demonized and hunted, they tend to spook easily, often running away at the first sign of trouble. They however generally curious, cleaver, and peaceful.
+2 Dex, +1 Int
Speed 30
Darkvision 30'
Teleport: You can teleport at-will on your turn, or as a reaction after you are hit or missed with an attacked, but doing so is draining. You take 1 point of damage for each 5' you teleport. You do not need to see where you teleport, but if you try and teleport into a solid object or occupied space, you fail and take twice the force damage. You can also bring 1 willing creature, or 200 lbs of extra weight, by taking double the damage (4x the damage if you teleport into a wall).. The teleporting also makes a small "Bamf" sound at both your entrance and exit that can be heard nearby.
Prehensile tail: You can use your tail to hold things, giving you 1 extra item interaction per turn, though it's not as deft as your hands. Any attack or skill check made with your tail has disadvantage, and you cannot benefit from holding a shield, or reload a weapon with it. In addition, you have advantage on any check to remain balanced.
Shadow Bending: You can blend in with the shadows. You can make stealth checks in dim light, as if you were in total darkness. In addition, if you hide in darkness, creatures cannot use darkvision to see you.
Comical Vistage: Your blue skin and strange hands make it difficult for people to take you seriously. You have disadvantage on all charisma checks.