King Mackerel is a mermaid who is the ruler of Mertropolis and a character who only appears in the The Adventures of Super Mario Bros. 3 episode "The Ugly Mermaid." He has a daughter named Holly Mackerel.

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Characters	Protagonists	Luigi • Mario • Princess Toadstool • Toad
	Antagonists	Big Mouth Koopa • Bully Koopa • Cheatsy Koopa • Hip Koopa • Hop Koopa • King Bowser Koopa • Kooky von Koopa • Kootie Pie Koopa
	Supporting characters	Abominable Snowkoopa • Angry Sun • Baby Cheep • Baker • Block • Bloober • Bloober baby • Bloober with kids • Bob-omb • Boo Diddly • Boom Boom • Boomerang Brother • Boss Bass • Bud • Bud and Missy's mother • Bullet Bill • Cannonball • Chain Chomp • Cheep-Cheep • Crime Wave Clyde • Cutter • Doctor • Dry Bones • Emperor Ed • Fire Brother • Fire Chomp • Firesnake • Giant Land Para-Goomba • Gondolier • Goomba • Hammer Brother • Herman • Holly Mackerel • Hot Foot • Jelectro • Junior • Junior's mom and dad • King Mackerel • King Windbag • Kitty • Koopa Paratroopa • Koopa Zombie • Kuribo's Goomba • Lakitu • Lava Lotus • Madzilla • Madzilla's Mom • Magic Piranha Plant • Marco Polo's Plumbers • Mayor of New York City • Mighty Plumber • Milli Vanilli • Missy • Mr. President • Mrs. President • Mushroom Kingdom Fire Department • Mushroom Marauder and Jake the Crusher Fungus • Mushroom Nanny • Mushroom People • Mushroom Referee • Nipper Plant • Norman • Painter • Para-Beetle • Para-Goomba • Piranha Plant • Pipe creatures • Prince Hugo • Prince Mushroomkhamen • Ptooie • Queen Mushroomkhamen • Robot Princess • Rocky Wrench • Royal Parrot • Servant • Sledge Brother • Spiny • Spiny Egg • Submarine captain • Sultan • Thwomp • Toad's cousin • Wizard King of the West
Episodes	Episodes	"Sneaky Lying Cheating Giant Ninja Koopas" • "Reptiles in the Rose Garden" • "Mind Your Mummy Mommy, Mario" • "The Beauty of Kootie" • "Princess Toadstool for President" • "Never Koop a Koopa" • "Reign Storm" • "Toddler Terrors of Time Travel" • "Dadzilla" • "Tag Team Trouble" • "Oh, Brother!" • "Misadventure of Mighty Plumber" • "A Toadally Magical Adventure" • "Misadventures in Babysitting" • "Do the Koopa" • "Kootie Pie Rocks" • "Mush-Rumors" • "The Ugly Mermaid" • "Crimes R Us" • "Life's Ruff" • "Up, Up, and a Koopa" • "7 Continents for 7 Koopas" • "True Colors" • "Recycled Koopa" • "The Venice Menace" • "Super Koopa"
Locations	Mushroom World regions	Dark Land • Desert Land • Giant Land • Mertropolis • Mushroom Kingdom • Mushroom Sea • Pipe Land • Sky Land • Underground Maze of Pipes • Water Land
	Mushroom World landmarks	Ace Magic Wand Factory • First Mushroom Bank • Kastle Koopa • Mushroom Castle • Mushroom Kingdom Orphanage • Mushroom Kingdom Treasury • Mushroom Land Central Library • Pipe Land Treasury • Temple of Gloom
	Real World regions	Africa • Antarctica • Australia • Brooklyn • Hawaii • Hollywood • Miami • New York City • North America • Paris • South America • United States of America • Venice • Washington, D.C.
	Real World landmarks	Bastille • Eiffel Tower • Florida State Poochitentiary • Great Wall of China • Hollywood Bowl • Kennedy Space Center • Louvre • Washington Monument • White House • Wild Waldo's One-of-a-Kind Amusement Park
Items and objects	Items and objects	? Block • Block • Doom Dancer Music Box • Doom Ship • Doom Sub • Fire Flower • Fireball • Frog Suit • Fudjie • Gold Coin • Jump Block • Karoobi • Koopa Color Goopa • Koopa Clogger • Kooper-Dooper Raiser-Upper • Koopa trash • Koopascope • Lame Brainer • Levitation Beam • Magic wand • Nasty Net • Nice Guy Potion • Plumber Pole • Plumber's Periscope • Plumber's Putty • Power Pendant • Power Shower • Starman • Steam Cloud Balloon • Steam powered mummy sled • Super Leaf • Super Slurp Pipe • Tag Team Wrestling Tournament • Tank • Time Travel Tube • Transmutational Brainwave Analyzer • Trash Smasher • Crud Cannon • Warp Pipe
Miscellaneous	Other	Gallery • Quotes