Black Jo

Back and track. As a bonus action, Jo can move back and give himself either extra movement up half of his base movement, and if he hits a wall or obstacle while he goes back, he instead gains advantage on one of his shots. 

Deaths chambers. Once every turn Jo rolls a d10, if he rolls 1-2, his next multiattack can have extra d6 necrotic.

Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Multiattack. Jo can make up to 3 attacks. 2 with his guns and one with his hands or bite(only if someone is within his reach). He can use his last action to reload if needed.

Gun. Ranged Weapon Attack: +6 to hit, reach 120 ft., multiple in cone target. Hit: 7 (1d6 + 4) piercing damage.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d4 + 4) slashing damage.

1. Hide
2. Disengage
3. Reload after 6 shots
4. Back and track. As a bonus action, Jo can move back and give himself either extra movement up half of his base movement, and if he hits a wall or obstacle while he goes back, he instead gains advantage on one of his shots. 
5. Deaths chambers. Once every turn Jo rolls a d10, if he rolls 1-2, his next multiattack can have extra d6 necrotic.
6. melee (once a turn)

As a legendary action Jo can:

1. Disengage freely and dash at the same time (x4)
2. Instantly reload his weapons and the next shot for free (x2)