Strahd von Zarovich

If Strahd isn't in running water or sunlight, he can use his action to polymorph into a Tiny bat, a Medium wolf, or a Medium cloud of mist, or back into his true form.
While in bat or wolf form, Strahd can't speak. In bat form, his walking speed is 5 feet, and he has a flying speed of 30 feet. In wolf form, his walking speed is 40 feet. His statistics, other than his size and speed, are unchanged. Anything he is wearing transforms with him, but nothing he is carrying does. He reverts to his true form if he dies.
While in mist form, Strahd can't take any actions, speak, or manipulate objects. He is weightless, has a flying speed of 20 feet, can hover, and can enter a hostile creature's space and stop there. In addition, if air can pass through a space, the mist can do so without squeezing, and he can't pass through water. He has advantage on Strength, Dexterity, and Constitution saving throws, and he is immune to all nonmagical damage, except the damage he takes from sunlight.

If Strahd fails a saving throw, he can choose to succeed instead.

When Strahd drops to 0 hit points outside his coffin, he transforms into a cloud of mist (as in the Shapechanger trait) instead of falling Unconscious, provided that he isn't in running water or sunlight. If he can't transform, he is destroyed.
While he has 0 hit points in mist form, he can't revert to his vampire form, and he must reach his coffin within 2 hours or be destroyed. Once in his coffin, he reverts to his vampire form. He is then Paralyzed until he regains at least 1 hit point. After 1 hour in his coffin with 0 hit points, he regains 1 hit point.

Strahd regains 20 hit points at the start of his turn if he has at least 1 hit point and isn't in running water or sunlight. If he takes Radiant damage or damage from holy water, this trait doesn't function at the start of his next turn.

Strahd can climb difficult surfaces, including upside down on ceilings, without having to make an ability check.

Strahd has the following flaws:
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Forbiddance
He can't enter a residence without an invitation from one of the occupants.
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Harmed by Running Water
He takes 20 Acid damage if he ends his turn in running water.
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Stake to the Heart
If a piercing weapon made of wood is driven into his heart while he is Incapacitated in his coffin, he is Paralyzed until the stake is removed.
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Sunlight Hypersensitivity
While in sunlight, Strahd takes 20 Radiant damage at the start of his turn, and he has disadvantage on attack rolls and ability checks

Strahd makes two attacks, only one of which can be a bite attack.

Melee Weapon Attack +9 to hit, reach 5 ft., one target. 8 (1d8 + 4) Slashing damage, plus 14 (4d6) Necrotic damage. If the target is a creature, Strahd can grapple it (escape DC 18) instead of dealing the Slashing damage.

Melee Weapon Attack +9 to hit, reach 5 ft., one willing creature, or a creature that is Grappled by Strahd, Incapacitated, or Restrained. 7 (1d6 + 4) Piercing damage plus 10 (3d6) Necrotic damage. The target's hit point maximum is reduced by an amount equal to the Necrotic damage taken, and Strahd regains hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if its hit point maximum is reduced to 0. A humanoid slain in this way and then buried in the ground rises the following night as a Vampire Spawn under Strahd's control.

Strahd targets one humanoid he can see within 30 feet of him. If the target can see Strahd, the target must succeed on a DC 17 Wisdom saving throw against this magic or be Charmed. The Charmed target regards Strahd as a trusted friend to be heeded and protected. The target isn't under Strahd's control, but it takes Strahd's requests and actions in the most favorable way and lets Strahd bite it.
Each time Strahd or his companions do anything harmful to the target, it can repeat the saving throw, ending the effect on itself on a success. Otherwise, the effect lasts 24 hours or until Strahd is destroyed, is on a different plane of existence than the target, or takes a bonus action to end the effect.

Strahd magically calls 2d4 Swarms Of Bats or Swarms Of Rats, provided that the sun isn't up. While outdoors, Strahd can call 3d6 Wolves instead. The called creatures arrive in 1d4 rounds, acting as allies of Strahd and obeying his spoken commands. The beasts remain for 1 hour, until Strahd dies, or until he dismisses them as a bonus action.

Strahd moves up to his speed without provoking opportunity attacks.

Strahd makes one unarmed strike.

Strahd makes one bite attack.