As a Kitsune you have the ability to shift between multiple forms, as an action you can change between the following:

• Human Form- While in your human form you blend in with others. You lose your tails, ears and fur to walk around unnoticed. Also, your clothing and equipment doesn't change, and if a creature suspects that you aren't human, you have advantage on any Charisma (Deception) checks to avoid detection. 
  
  
• Kitsune Form- While you are in this fox-like form you gain advantage on Dexterity (Stealth)checks, but you gain disadvantage on any Strength checks or saves. Your ears, tails, fur and claws come back. Your claws become natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal slashing damage equal to 1d4 + your Strength or Dexterity modifier, instead of the bludgeoning damage normal for an unarmed strike. 
  
  
• Fox form- You may only use this form three times per long rest, shifting into a fox through the same effects as the Polymorph spell. The statistics for your fox form are the same as a [monster]Mastiff[/mosnter]

Your Dexterity score increases by 2 and your Wisdom score by 1.

Kitsune can live up to about 850 years. They are born with a single tail, but can grow a new tail almost every 100 years. They are not seen as adults by their kind until they have at least 2 tails.

As tricksters Kitsune tend to be generally chaotic. Good or neutral for the most part, it would take a great ordeal to become one evil. 

Kitsune stand anywhere from 5 to 6 feet tall on average. Your size is Medium.

Your base walking speed is 30 feet.

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 Saving Throws against being Charmed, and magic can’t put you to sleep.

You know the Produce Flame cantrip. When you reach 3rd level, you can cast the Faerie Fire spell as a 1st level spell once with this trait and regain the ability to do so when you finish a Long Rest. When you reach 5th level, you can cast the Scorching Ray as a 2nd level spell once with this trait and regain the ability to do so when you finish a Long Rest. Wisdom is your Spellcasting ability for these Spells

You can speak, read, and write Common and Sylvan. In addition, you gain the benefits of Speak with Animals spell at will.