Source | Data |
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Mega Man ZX Advent Database | B12 Thetis Model L Biomatch (Ice Mega Man). At a glance, he's an upstanding, kind, model-citizen. But, there's a nasty side to him too. He intends to punish people for polluting the sea with waste. |
Mega Man ZX Advent manual | "Let me show you something!" Model L's Biomatch. This gentle youth loves swimming and the sea. He is growing to despise humanity for its reckless disregard for the environment in the name of progress. |
Rockman ZX Series Official Blog | The Biometal Model L Biomatch, who transforms into the Ice Mega Man. A kind-looking boy who is a model-citizen that loves swimming. He hoped that the sea, which had been polluted by the past war, would become peaceful and clean, but the industrial development of every country is polluting it again. He despises the current actions of humanity.[JP] |
Rockman ZX Advent Official Complete Guide | The Model L Biomatch, who transforms into the Ice Mega Man. Slightly younger than the other Mega Men, he is a kind-hearted model-citizen, but has a sarcastic side to him. He thought that the seas, which were polluted by war, would become clean with peace, but he is angry that that they are becoming polluted again by the development of various countries. He is trying to awaken Model W to destroy those who continue to pollute.[JP] |
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Thetis
![]() Artwork from Mega Man ZX Advent. | |
![]() ![]() Dialogue portrait(s) | |
General information | |
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Name(s): | Thetis, Tethys |
Title(s): | Ice Mega Man |
Type(s): | Boss |
Lore Details | |
Affiliation(s): | Mega Men |
Appearances | |
Game(s): | |
Other Media: | None |
Stage(s): | Highway |
Game Info | |
Weakness(es): | Fire |
Element(s): | Ice |
Reward(s): | A-Trans: Thetis |
Behind the Scenes | |
Voice (JP): | Hisayoshi Suganuma |
Voice (EN): | Dillon Font |
Thetis (テティス, lit. "Tethys") is an antagonist in Mega Man ZX Advent. He is the Biomatch for Model L, and one of four rival Mega Men seeking to awaken Model W and win the Game of Destiny. He plans to use Model W to destroy humanity and restore the world's nature.
Physical appearance
Thetis is a Reploid with medium-length blue hair with an "ahoge" lock of hair pointing upwards. He wears a baggy blue hoodie over his archetypal Mega Man vest, along with white thigh-high leggings. He has red eyes, like the other rival Mega Men.
When he Megamerges with Model L, Thetis gains blue Mega Man armor. He loses his hoodie and gains an aerodynamic helmet with a long thruster extending from the back. He wields a double-sided beam lance called the Halberd.
Personality
Thetis is a warped version of Fairy Leviathan. Like her, he has a gentle and playful temperament that masks a dangerous fascination with battle. He loves to swim and has a deep appreciation with marine life, preferring to spend time in nature rather than with people. However, he holds little of Leviathan's maturity or empathy, fighting to destroy civilization instead of to protect it. He hates humanity for polluting the oceans, and participates in the Game of Destiny to enact a total genocide and restore the Earth to a pure state. Notably, he views himself and the other Mega Men as superior to humanity.
In the Games
Mega Man ZX Advent

Thetis debuted in Mega Man ZX Advent. His backstory is left a mystery, but he loves swimming and has a deep connection to oceans and wildlife. When he was approached by Prometheus and Pandora, he accepted Model L and joined the Game of Destiny to eradicate humanity for its pollution and restore the planet to its natural state.[1][2]
Thetis first appears alongside Atlas in the Arctic Ice Floe, where they face Grey/Ashe after hearing about them from Prometheus. Thetis Megamerges with Model L but claims he doesn't want to fight right now, letting Atlas shatter the ice before they depart.
Thetis is next found in the Highway, where he defends the Model W core responsible for flooding the city with ice water. He shows Grey/Ashe the extent of humanity's pollution and challenges them, leading to a boss battle. Upon his defeat, he retreats and takes the Model W core with him. Grey/Ashe then absorbs Thetis' DNA data for A-Trans, which also unlocks a Model A cipher that reveals the roles of Prometheus and Pandora in the Game of Destiny.
After the Pseudoroid boss attack in Ouroboros, Thetis returns alongside the other Mega Men to defend Albert. Vent/Aile keeps them busy, allowing Grey/Ashe to face Albert alone. Once Grey/Ashe destroys Albert and triggers the collapse of Ouroboros, Model Z immobilizes Thetis via Model L, allowing Vent/Aile to escape with the unconscious Grey/Ashe. Thetis disappears in the collapse with the other Mega Men.
In the bonus Extreme mode ending, Thetis is summoned to serve Master Thomas alongside the other three Mega Men. The significance of this is left a mystery due to the cliffhanger ending of the ZX era.
Other Media
- In the Rockman ZX Advent manga, Thetis appears in the final issue with the other Mega Men as the Game of Destiny begins.
Official Data
Source | Data |
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Rockman ZX Advent Database | TBA |
Rockman ZX Advent manual | TBA |
Rockman ZX Series Official Blog | TBA |
Rockman ZX Advent Official Complete Guide | TBA |
Gallery
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Artwork from Mega Man ZX Advent.
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Artwork from Mega Man ZX Advent.
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Artwork from Mega Man ZX Advent.
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Concept art for Mega Man ZX Advent.
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Concept art for Mega Man ZX Advent.
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Cutscene art from Mega Man ZX Advent.
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Cutscene art from Mega Man ZX Advent.
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Cutscene art from Mega Man ZX Advent.
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Sprite from Mega Man ZX Advent.
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Sprite from Mega Man ZX Advent.
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Panel from the Rockman ZX Advent manga.
Behind the Scenes
Nomenclature
Language | Name | Origin |
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Japanese | Tethys (テティス) | Tethys is one of the moons of the planet Saturn, a theme shared among the rival Mega Men. This moon is named after a Greek Titan, Tethys, who is the mother of the river gods and the Oceanids. |
English | Thetis | Thetis is a Greek mythological figure, often depicted as a sea nymph or water goddess. |