Baby Yoda

Special Trait: If you fail in a Charisma saving throw, then you are then possessed by Baby Yoda and will not attack him. (Baby Yoda rarely attacks someone unless attacked)

Spellcasting: Baby Yoda knows only two spells automatically and can't use any other, Force push, and Force choke. Baby Yoda's spell save DC is 14, and it's spell casting ability is Charisma, it's spell attack bonus is +5.

Action: Baby Yoda can cast a spell or interact with a single person.

Action Melee Attack: Baby Yoda has one Melee attack, and that is Unarmed Strike: +4 Hit and 3 Bludgeoning damage. 

Action Ranged Attack. Baby Yoda doesn't have a ranged attack weapon, but can use Force Push or Force choke: Automatic 5 damage. (Using Force Choke allows you to not roll 1d20 to see if you penetrate the targets armor, it's an automatic 5 Force damage.) Force Push allows you to push the target 20 feet away. (This attack uses a cone)

Reaction: Once Baby Yoda is surprised it automatically gets off, before your attack, a Persuasion check. (You have to get higher than it's own Charisma total)

Enter the description for how legendary actions work for your monster here.

Legendary Action Name (Costs 5 Actions). One tough cookie: This creature will only allow you to earn Baby Yoda as a pet.