A Slimeperson's Constitution increases by +2, and their Charisma increases by +1

Slimepeople are used to their own level of acidity, and when struck by a heavy blow they tend to shrug it off as if it didn't bother them. They gain resistance to Acid and Bludgeoning damage.

A Slimeperson can move through a space as narrow as 1 inch wide without squeezing.

Normal forms of restraint are useless. Unless someone or something seals your entire body, or unless it is magical, you cannot be Restrained and you have advantage on attempts to escape being Grappled. Additionally, your stickiness allows you to have advantage on Grappling other creatures.

Growing up in dark caves or dim labs, Slimepeople are used to a certain level of darkness. You have superior vision in dark and dim conditions. 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.

Slimepeople grow incredibly fast, reaching physical and emotional maturity at around two years old. No one knows when exactly they die of old age, but some estimates reach as far as 500 years.

Slimepeople can be any alignment, but their usual demeanor often pegs them near the more chaotic and good alignments.

A Slimeperson knows Undercommon as well as Common

Whenever you move by swimming you have disadvantage on saving throws and your movement speed is halved until the start of your next turn after you leave the water.

You may add 1d4 acid damage to any unarmed attack you make, and if you successfully Grapple a creature, you may add it then, too. For each of your turns you continue to Grapple that creature, you may deal 1d4 acid damage to hem.