Oozekin
Size: medium
Type: aberrant humanoid
speed: 30
Unsettling form. When a creature you can see makes an attack roll against you, you can use your reaction to impose disadvantage on the roll. You must use this feature before knowing whether the attack hits or misses. Using this trait reveals your shapeshifting nature to any creature within 30 feet that can see you and you gain a climb speed of 30 until the end of your next turn. You can use this feature a number of times equal to your proficiency bonus. You must then complete a long rest before you can use this feature again.
Change Appearance. As an action, you can transform your appearance or revert to your natural form. You can't duplicate the appearance of a creature you've never seen, and you revert to your natural form if you die. You decide what you look like, including your height, weight, facial features, the sound of your voice, coloration, hair length, sex, and any other distinguishing characteristics. You can make yourself appear as a member of another race, though none of your game statistics change.
Aberrant anatomy. You have resistance to acid damage and have advantage on saves made to resist any spell or effect that would alter your form. When you move, you can squeeze and crawl in a space as small as 4 inches on a side.