Zeezi, The Kaiju Overlord

Nightclub Familiarity: Zeezi thrives in urban and indoor environments, particularly clubs or party venues. While in such an environment, she gains advantage on attack rolls and saving throws due to her intimate knowledge of the space.

Bassquake: The pounding bass of her favorite nightclubs reverberates through her kaiju form. Creatures within 60 ft. must succeed on a DC 19 Constitution saving throw or be dazed until the start of their next turn as the vibrations disorient them.

Predatory Frenzy: Whenever a creature is reduced to 50% HP or less within 30 ft., Zeezi gains a bonus action that can be used to make a Tail Swipe or Claw Attack against them.

Phase 2 Traits

Colossal Club Rampage. 
When Zeezi is reduced to 50% of her maximum hit points, Gains +2 AC, and 50 temporary hit points,  All melee attacks deal an additional 2d8 bludgeoning damage, Atomic Breath now recharges on 4–6 instead of 5–6.

Club Queen: In her lair or any nightclub-like environment, Zeezi can move through creatures’ spaces without provoking opportunity attacks, and she gains advantage on attack rolls against creatures prone or restrained.

Bassquake Overload: Creatures within 60 ft. must make a DC 20 Constitution save or take 2d6 psychic damage and be staggered (their movement is halved) until the start of their next turn.

Predatory Frenzy (Enhanced): Whenever a creature is reduced to 50% HP or less within 60 ft., Zeezi can use her bonus action to make two melee attacks (Tail Swipe or Claw Strike) against them instead of one

Multiattack: Zeezi makes three attacks: Tail Swipe, Claw Strike, or Atomic Breath.

Tail Swipe: Melee Attack: +14 to hit, reach 15 ft., one target. Hit: 28 (4d10 + 8) bludgeoning damage.

Claw Strike: Melee Attack: +14 to hit, reach 10 ft., one target. Hit: 25 (3d12 + 8) slashing damage.

Atomic Breath (Recharge 5–6): 90-ft. line, 10-ft. wide. Each creature must make a DC 22 Dexterity save, taking 45 (10d8) fire on a failed save, or half as much on a success.

Gregarious Roar: Once per round, Zeezi can emit a deafening roar amplified by nightclub acoustics. All creatures within 30 ft. must make a DC 20 Wisdom saving throw or be frightened until the start of their next turn.

Phase 2 Action

Multiattack: Zeezi makes four attacks: Tail Swipe, Claw Strike, Atomic Breath, or Neon Shockwave (any combination).

Atomic Breath (Phase 2): 90-ft. line, 15-ft. wide. DC 23 Dexterity save for 55 (12d8) fire, half on success. Concentration checks against it are at disadvantage.

Neon Shockwave (Phase 2): DC 22 Dexterity save, 35 (8d8) lightning damage to all creatures within 30 ft. Targets take an additional 1d6 psychic damage as chaotic neon and music disorient them.

Zeezi can take 3 legendary actions (4 in demonic form) choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature’s turn. Zeezi regains spent legendary actions at the start of its turn.

• Tail Sweep: Make a Tail Swipe attack.

• Atomic Burst: Make an Atomic Breath attack (costs 2 actions).

• Neon Shockwave (Costs 2): A burst of club lighting hits all creatures within 20 ft., DC 20 Dexterity save for 27 (6d8) lightning damage.