Armored Bounty Hunter

Spellcasting. The Bounty Hunter is a 6th-level spellcaster. Its spellcasting ability is 18 INT. The Bounty Hunter has following Wizard spells prepared:
Cantrips (at will): Fire bolt, shocking grasp 
1st level (4 slots): Shield, magic missile 
2nd level (3 slots): Hold Person, Magic Weapon
3rd level (3 slots): Fireball

Dagger. Melee Weapon Attack: +5 to hit, reach 20 ft., 1 target. Hit: 7 (1d4 + 4) piercing damage. 

Light Crossbow. RangedWeapon Attack: +5 to hit, range 80/320 ft., 1 target. Hit: 7 (1d8+ 2) piercing damage.

Multiattack. The Bounty Hunter makes two attacks with his dagger.

Winged Boots. The Bounty Hunter can activate his winged boots to gain a flying speed equal to his walking speed per round.

Second Wind: (Recharges after a Short or Long Rest). As a bonus action, the Bounty hunter can regain 20 hit points.

Action Surge: (Recharges after a Short or Long Rest). On his turn, The Bounty Hunter can take one additional action.

Protection. When a creature The Bounty Hunter can see attacks a target other than him that is within 5 feet of him, he can use a reaction to shield the attack target to impose disadvantage on the attack roll.

Armored Bounty Hunter as a Mythic Encounter

The Bounty Hunter serves as a canon way for a player to miss several sessions without any real consequences.

Carbon Freezing: The Bounty Hunter casts flesh to stone on one creature within a 60 Ft. range.

Instant Teleport: The Bounty Hunter, when in possession of his target, will take out a spell scroll and teleport away with his target.

Bounty Slip: The Bounty Hunter will leave behind evidence of who posted the bounty, so the party can regain their lost party member.