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The worst possible thing I can think of is loneliness, separation, isolation. It's true for us, so why can't it be true for them as well?
~ Catherine, speaking out against Ansgar's ideals



Catherine is the main protagonist of Monster Mansion, being unintentionally thrust into her role through happenstance when she discovers the existence of the race known as "monsters", who are generally hidden from humanity's eye.

After much convincing, Catherine is taught of the monsters' history of being stuck living inside underground mansions, in hiding from humans for millennia after a vicious war between the two races broke out. In a bid to help the monsters someday integrate into society, Catherine becomes a volunteer worker for the mansion, going out on missions and various adventures to learn more about monster cultures and hopefully become an ambassador to bridge the gap between the two species.

In Monster Mansion: Afteryears, after having saved the world and humanity from destruction at the hands of Colden, Catherine worked for nearly 20 years afterwards to help with the resulting integration of monsters into modern society, eventually becoming the current housemaster of the mansion that she accidentally stumbled into almost two decades ago.


Catherine is a kind, patient girl. She has a strong desire to help others and has a naturally strong sense of justice and right and wrong. She is, however, a person who naturally seeks to forgive others, despite possible wrongdoings. She is also characteristically naive, but wishes to always expand her knowledge of the world and, later, reality as a whole.

Catherine's biggest driving factor is discovering her own purpose in life. Despite many attempts, she has found little success in discovering a hobby or profession that she wishes to invest her life into, often finding herself drifting in and out of activities and friend groups as she looks to find her calling in life. She is enticed by the idea of going on a grand adventure like those in the stories she reads,

As an adult, Catherine is a very laid back, yet wise and caring woman. Still holding onto her position as housemaster, she is a benevolent leader for the humans and monsters under her care. In battle, Catherine is playful and incredibly confident, as her magical abilities have developed to become incredibly powerful to the point where she is one of the strongest mages in recorded history.

Personal Statistics

Alignment: Neutral Good

Name: Catherine Aberdeen

Origin: Monster Mansion

Gender: Female

Age: 16-17 (Monster Mansion) | 36-37 (Monster Mansion: Afteryears Pre-Timeskip) | 42 (Post-Timeskip)

Classification: Human

Date of Birth: October 25th

  • Zodiac/Horoscope: Scorpio

Birthplace: Lyon, France

Weight: 135 lbs

Height: 5'6'' as a teenager, 5'11" as an adult

Hobbies: Soccer, creative writing, history

Status: Alive

Affiliation: Elise, Arachne, Mottie, Wolfgang, Shiori, Sun, Violet, Galatea, Ciro, Leviathan, Alex, 7th Monster-Human Squadron (Kyler, Zinnia, Mira, Axl, Celica, Elliott, Lyssa, Rebecca, Nero)

Character Themes: Magical Journey, The Reaper Rises, Flight of the Dragons, Weaver of Fate, A Mother Scorned

Powers and Stats

Tier: 9-B to 7-A, 6-C with Fleur Cannon | 6-B | 6-A | 5-C | 4-C | 3-C | 3-A

Powers and Abilities: Superhuman Physical Characteristics, Elemental Manipulation (Fire, Water, Ice, Electric, Wind, Earth, Nature), Darkness Manipulation, Spatial Manipulation, Rainbow Manipulation (A combination of all of her other magic types, which carries the power and abilities of all 10 of them), Life Manipulation with Fleur Cannon, Healing (Only to others), Flight, Durability Negation through Soul Eraser

Attack Potency: Wall Level (Launched Mottie hard enough to smash her straight through a wall) to Mountain Level (Defeated Arsene O'Share's muscular form), Island Level with Fleur Cannon (Completely destroyed an island with Fleur Cannon during her fight with the Sirens) | Country Level (The Deathseeker Scythe, when it is recieved, is stated to be capable of destructive feats greater than Fleur Cannon) | Continent Level (Defeated Behemoth, who lifted and moved the Australian and Pacific tectonic plates at the same time) | Moon Level (Fought and defeated Leviathan, who destroyed Earth's second moon during his battle with Yaldabaoth with an errant blast of magic) | Star Level (Destroyed full-power Colden, who created a pocket dimension bigger than the sun) | Galaxy Level (Killed Elysium, one of Yaldabaoth's Archons who created all of the galaxies in the universe) | Universe Level (Matched and fought off Yaldabaoth's human avatar)

Speed: Normal Human (Recorded to have ran at a top speed of 6.3 m/s before obtaining any form of magic training) to Subsonic (Capable of running fast enough to blitz most ordinary humans and monsters) | Subsonic (Should be comparable to her base speed) | Hypersonic (Blitzed Hal's flying form, which can reach Mach 1 in less than a second) | Massively Hypersonic+ (Kept up with Ciro and Leviathan at the same time) | Relativistic (Kept up with and eventually outsped full-power Colden, during their battle the two traversed the distance between the Earth and the Moon within seconds multiple times) | Massively FTL+ (Matched Elysium, the fastest of Yaldabaoth's Archons who can traverse the Local Group in seconds) | Massively FTL+ (Kept up with and was able to barely outspeed Yaldabaoth's human avatar)

Striking Strength: Wall Class to Island Class | Country Class | Continent Class | Moon Class | Star Class | Galactic | Universal

Lifting Strength: Varies

Durability: Wall Level to Mountain Level | Mountain Level | Continent Level | Moon Level | Star Level | Galaxy Level | Universe Level

Range: Standard Melee Range, up to hundreds of meters with elemental weapons, up to Planetary with magic

Stamina: Extremely High

Intelligence: Above Average

Standard Equipment:

-Book of Magic: A compendium of her magic spells and abilities that she keeps on her person at all time to remember when necessary

-Elemental Weapons: Melee weapons made from her elemental magic, each carries their respective elemental affinity with them. These include a fire sword, water tomahawk, electric trident, earth gauntlets, wind bow, and nature lance.

-Deathseeker Scythe: A large scythe with a dark blue blade that houses the intense magical power of ice, containing the strength of death within itself. Its power is sealed within, but when awakened by its user's willpower, they become the image of Death itself, the Black Reaper, granting them immense strength.

-Chaosbringer: A huge, black scythe that comes into being once the wielder of the Deathseeker Scythe fully embraces the darkness within them, bringing this ancient scythe forged by Nyarlathotep into being, and turning its wielder into the Chaos Reaper, an ancient being said to have controlled the primordial chaos of the world.

Weaknesses: As a teenager, using Fleur Cannon drains her of all magic power for 24 hours. Cannot heal herself with healing magic. Can be manipulated easily when her friends and family, especially her son, are at risk.

Key: Base | With the Deathseeker Scythe | Black Reaper | Post-Dragon Training | Chaos Reaper | Adult | True Chaos Reaper


Notable Victories:

Notable Losses:

Inconclusive Matches: