Ancient Mermaid is the Legendary Warrior possessing the attribute of "Water", it is one of the legendary Ten Warriors Digimon that saved the ancient Digital World. A Mega who existed only in the distant past, it is a guardian goddess of the birthplace of Digimon, the "Net Ocean." Ancient Mermaidmon's abilities were later passed on to the Aquatic Digimon.

Tier: 1-C

Classification: Mega-level Data Attribute Ancient Aquatic Beast Man Digimon, Legendary Warrior of Water

Powers and Abilities: Superhuman physical characteristics, digimon physiology (Holy power, Darkside power), water manipulation, acid manipulation (Via Jealousy Rain), water crystal manipulation (Via Crystal Blow), limited body control (Via Titanic Charge), corrosion inducement (Via Necro Corso), social influencing (Via Charm Plunder), trident, and anchor mastery

Attack Potency: Complex Multiverse level (Comparable to Ancient Greymon)

Speed: Immeasurable (Equal to Ancient Greymon)

Lifting Strength: Unknown

Striking Strength: Complex Multiverse Level

Durability: Complex Multiverse Level

Stamina: Superhuman

Range: Extended Melee Range, Planetary with water manipulation

Standard Equipment: Trident and Anchor

Intelligence: Ancient Mermaidmon is likely an extremely skilled fighter and should be comparable in skill to the other Warrior Ten.

Weakness: None notable

Notable Attacks and Techniques:

•Great Maelstrom: Creates a huge whirlpool that captures enemies in the middle of the water.

•Crystal Billow: Creates water crystal bullets, firing them like a machine gun.

•Rain Stream (Drainin' Rain): Creates a cloud that pours down rain or a stream of water to crush the enemy.

•Jealousy Rain (Dark Vapor): Creates an acidic cloud that dissolves the enemy.

•Aqua Needle (Whipin' Waves): She manipulates the water to attack her foes.

•Necro Corso (Acid Ink): Sprays corrosive ink from her mouth.

•Titanic Charge (Titanic Tempest): She hardens her mantle, spins like a drill, and then smashes into the enemy.

•Charm Plunder: Draws near while adorning her beautiful mermaid like figure, and instantly pierces the enemy with her golden anchor.

•Northern Cross Bomber: Spins her golden anchor in a turbulent manner to pulverize the enemy.