Your creature type is Ooze, rather than humanoid.

One ability score of your choice increases by 2, and one other ability score of your choice increases by 1.

Typically speaking, only slimes that live to become ancient are able to evolve. That said, they tend to count their age based on when they developed consciousness rather than when they were actually born.

Humanoid Slimes tend to take their alignment, as well as their main personality traits, from the most potent and influential food source they've had (typically some unlucky adventurer). Displaying personality traits of that person as they assimilate them as a main component in their evolution.

 Your base size is either Medium or Small. It is typically determined by the size of the same person that has the highest impact on your alignment.

Your base walking speed is 30 feet.

You were were born a slime, your intelligence was developed, but your fortitude was inherited:

• You have advantage on saving throws against being poisoned, and you have resistance to poison damage.
• You don’t need to eat, drink, or breathe.
• You are immune to disease.
• You don’t need to sleep, and magic can’t put you to sleep.

When you take a long rest, you must spend at least six hours in an inactive, motionless state, rather than sleeping. In this state, you appear inert, but it doesn’t render you unconscious, and you can see and hear as normal.

You're Slime Body makes it difficult for attacks to deal damage to you.

While you are not wearing any armor, your Armor Class equals 10 + your Dexterity modifier + your Constitution modifier. You can use a Shield and still gain this benefit.

You gain one skill proficiency and one tool proficiency of your choice.

You can speak, read, and write Common and one other language of your choice.