Alyssa Vantrove

Telepathic Bond. Alyssa ignores the range restriction on its telepathy when communicating with a creature it has charmed. The two don't even need to be on the same plane of existence.

Shapechanger. Alyssa can use its action to polymorph into a Small or Medium humanoid, or back into its true form. Without wings, Alyssa loses its flying speed. Other than its size and speed, its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Multiattack: Alyssa makes 2 attacks with Fiery Rose and 1 Claw attack

Claw (Fiend Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Fiery Rose (Magical Longsword): Melee Weapon Attack: +7 to hit, reach 5ft. one target. Hit: 9 (1d8 + 3) slashing damage + 10 (2d6) fire damage. 

Lustful Burn: Alyssa spends a bonus action to cause roses to form around the handle and a spiral of pink flames to swirl around the the blade of Fiery Rose. When attacking a creature with Lustful Burn activated the weapon does an extra 2D6 fire damage. On top of that if the target is neither immune to charming affects or an undead then they must make a DC 15 Charisma saving throw or become charmed by the wielder for 1 minute causing them to do whatever the wielder is asked of them (within reason). The saving throw is repeated at the end of the affected creatures turn. Additionally if the creature is under a charm of another creature when struck, it makes the saving throw with advantage.

Charm. One humanoid Alyssa can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys Alyssa's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend's Charm for the next 24 hours.

Alyssa can have up to three targets charmed at a time. If it charms another, the effect on the previous target ends.

Draining Kiss. Alyssa kisses a creature charmed by it or a willing creature. The target must make a DC 15 Constitution saving throw against this magic, taking 32 (5d10 + 5) psychic damage on a failed save, or half as much damage on a successful one. The target's hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Etherealness. as a bonus action Alyssa magically enters the Ethereal Plane from the Material Plane, or vice versa. 

Legendary Resistance (3/Day). If Alyssa Vantrove fails a saving throw, it can choose to succeed instead.