Your dexterity gains plus 1, as does your intelligence or charisma. 

Critters usually live not much more than one or two decades, maturing within a couple years of life.

Critters usually lean towards chaotic alignments, and often go against the will of the humanoids.

Critters generally range from 2 to 3 feat tall, but can be smaller. Your size is small. 

Your base walking speed is 25 feat. 

Because of your claws, you have a climbing speed of 20 feet. In addition, your claws are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal slashing damage equal to 1d4 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.

You can see in darkness for up to 60 feet. This does not allow you to see colour, as you only see it in shades of grey.

You are fast when things get too scary. You can dash or disengage as a bonus action.

Due to your enhanced intelligence, you gain one tool or skill proficiency and weapon proficiency of your choice. You also can craft this weapon without needing the tools, provided you have basic materials.

While within 60 ft. of a source of light, you gain advantage on stealth checks. 

As a Critter you can speak read and write Common.