Chucky

Innate Spellcasting. The Chucky can Innately cast the following spell. Its spellcasting ability is Intelligence (spell save DC 22, +14 to hit with spell attacks). 
At will: Cloud of daggers

Ambush.  Chucky has the advantage of attack rolls against creatures that haven't taken a turn in combat, and any hit Chucky gets on a surprised creature is a critical hit.

Evasion. If Chucky is subjected to an effect that would allow him to make a dexterity saving throw to take only half damage, he instead takes no damage if he succeeds on the saving throw, and half as much damage if he fails

Uncanny Dodge.When an attacker that he can see hits Chucky with an attack, he can use his reaction to halve the attacks damage.

Multiattack. Chucky makes as many stab attacks as he wants, but the number shouldn't go past 15 unless he REALLY wants to.  And it REALLY shouldn't go past 30 unless he really REALLY wants to.

Stab. Melee Weapon Attack: +19 to hit, reach 5 ft., 1 target. Hit: 13 (1d6 + 10) piercing damage. 

Stab. when a creature comes within 5 feet of Chucky, or is there at the beginning of its turn, Chucky can make one stab attack against it.

Chucky has 5 legendary actions.  He can only use one legendary action at the end of another person's turn.  

Stab (Costs 1 Action). Chucky makes one stab attack

Furry of Stabs (Costs 5 Actions). Chucky makes 6 stab attacks.  He can sacrifice one one these attacks to make one stab attack with the advantage on the attack roll