You are an Ooze.

You are Medium or Small. You choose the size when you select this race.

Your base walking speed is 30 feet.

You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You may mold your shape within a certain degree, changing facial features or physical attributes over the course of a short rest, so long as they fit the skeleton within.

 Being mostly made of ooze, it is difficult for you to manage heavier equipment. You are unable to wear Heavy Armor, nor can you use weapons with the Heavy property.

As a bonus action, you can extrude a pseudopod that is up to 6 inches wide and 10 feet long or reabsorb it into your body. As part of the same bonus action, you can use this pseudopod to manipulate an object, open or close a door or container, or pick up or set down a Tiny object. The pseudopod contains no sensory organs and can't attack, activate magic items, or lift more than 10 pounds.

Your unarmed attacks deal 1d6 Acid damage.

You know Common and one other language of your choosing that the skeleton inside you knew in life.

Choose between Gray, Green, Oblex, or Ochre

Gray

Gray slimes have psychic abilities.

Telekinetic Grasp. You gain the Mage Hand Cantrip. The hand can carry up to twice your Intelligence score in pounds (minimum of 10 lbs).

Telepathy. You can telepathically speak to a creature you can see within 30 ft of you, but they cannot communicate back in this way.

Green

Green slimes are a common ingredient in healing potions and have harnessed this power of healing.

Soothing Touch. As a Bonus Action you can touch a creature and heal them with a number of hit points equal to twice your character level. You can do this a number of times equal to your proficiency bonus until you finish a Long Rest. Alternatively as a Bonus Action, you may expend a use of your Soothing Touch to instead fill a bottle with your ooze. When a creature drinks this as a Utilize Action, they regain the same number of hit points. Ooze stored in this way expires after an hour, turning into salt water.

Oblex

Masters of disguise, Oblex slimes are able to (almost) seamlessly blend in with society.

Body Snatcher. As an action, you can consume a piece of a humanoid creature (Hair, nail, drop of blood, etc.) and mold yourself into it for 1 hour, taking on its appearance, mannerisms and voice. A creature can discern the disguise with a successful Investigation check (DC = 8 + your Charisma modifier + PB). This appearance does not hold up to physical inspection, revealing your ooze-like texture. You can use this feature a number of times equal to your Proficiency Bonus per long rest.

Flesh Memory. While disguised, you can access one superficial memory of the creature (the layout of a home, a loved one’s name, a mundane secret, etc.). The memory fades when the disguise ends.

Ochre

Ochre slimes are more mobile and particularly sticky, reaching places others cannot.

Spider Climb. You have a climbing speed equal to your walking speed. In addition, at 3rd level, you can move up, down, and across vertical surfaces and upside down along ceilings, while leaving your hands free.

Adhesive Movement. You can ignore difficult terrain caused by slippery or loose surfaces.