Your Dexterity score increases by 2 and your Wisdom score increases by one.

Were cat's mature at the same rate humans do but most live longer.

Were cats are most often good and even the tricksters among them are more playful than vicious.

Your size is Small in cat form and either medium or small depending on your parent race.  

Your base walking speed is 30 feet. This changes to 40 ft in cat form. You also have a climbing speed of 30ft while in cat form.

Accustomed to life underground, 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.

You have advantage on all Intelligence, Wisdom, and Charisma saving throws against magic.

You can speak, read, and write Common and one other language of your choice. You can also talk to cats of all kinds.

You can use an action to change between your humanoid form and cat form gaining the benefits of that form. In cat form you can't wield weapons and can only use armour that has made or adapted to fit you.

You can use the attack action to attack with your teeth or claws, which you can use your dexterity modifier for the scores. On a hit with your teeth you can deal 1d6 + your dexterity modifier piercing damage. On a hit with your claws you deal 1d6 +  your dexterity modifier slashing damage. After you use an action to attack with your teeth you can use an action to attack with your claws.