Leatherhead

Leatherhead was a sewer alligator who was exposed to Mutagen, which changed it into a more humanoid and intelligent being. Leatherhead has appeared in various Teenage Mutant Ninja Turtles media as an ally or an enemy of the Turtles.

The Miracle Elite's Villains
Main Antagonist Dormammu \| Izaya Orihara \| Pandora \| Hades \| Robert Hirano \| Dorian Gray \| Sheriff Vaisey and Jack the Ripper \| Richmond Valentine \| Major Members Kousuke Kira \| Dr. Fetus \| Elder God \| HAL 9000 \| Morpheus D. Duvall \| Marvin the Martian \| Phantom Blot \| Karkull \| Cthulhu \| Shuma Gorath \| Shadow King \| Minor Antagonists BIG Cheese \| Shadow Master (Double Dragon) \| Hirudegarn \| Archie Mitchell \| Riliane Lucifen d'Autriche \| Duskmon \| Black Lantern Corps \| King Henry \| Princess Hilda \| Villains from othe stories Malachite \| Galactus \| Zeus (God of War) \| BlackGarurumon \| Mister Sinister \| Jesse \| Albert Wesker \| Loki Laufeyson \| The Smoking Man \| Dukat \| Crowley \| Peter Pan \| Active Groups and Alliances The Children of Pandora Angel \| Arakune \| Beatrice \| Bernkastel \| Black Lady \| Cal Devens \| Coconuts \| Delia York \| Diva \| Dune \| Eriol Hiiragizawa \| Erza Knightwalker \| Haku \| Hansel and Gretel \| Hanzō Urushihara \| Haruna Niekawa \| Lambdadelta \| Lune \| Mai \| Minatsuki Takami \| Minene Uryuu \| Mysterio \| Mirai \| Nina Williams \| Overlord \| Princess Devilotte \| Princess Snow Kaguya \| Prowler \| Re'gish Wamik \| Regina \| Rumia \| Scratch and Grounder \| Shingen Kishitani \| Slender Man \| Suigintou \| Sunako Kirishiki \| Sunny Tennyson \| Tenshi Hinanawi \| Thetis \| Toshio Saeki \| Ty Lee \| Ultear Milkovich \| Umehito Nekozawa \| Virgilia \| Yumiko Takagi \| Zeref Dragneel \| The Bizarro League Chief Blue Meanie \| Colonel H. Stinkmeaner \| Hateocracy \| Darth Baras \| Heather \| Khyber \| Leatherhead \| Medusa Gorgon \| Nemesis T-Type \| The Fur Ghost \| Pearl Forrester \| Observer and Professor Bobo \| Riptor \| Poison \| Toad \| Le Frog \| Tobi \| Zira \| Seth \| Eggplant Wizard and King Hippo \| Ribet \| Phoenix Inc. Morpheus D. Duvall \| Admiral Daro'Xen \| Ma'alefa'ak \| Koragg \| Necrolai \| Sinistar \| Pyron \| Dr. Pyschobos \| Gizmo \| Mr. House \| Sammun-Mak \| Emperor Pilaf \| Star Sapphire \| The Great Intelligence \| Origami Killer \| Featherine Augustus Aurora \| Kin Tsuchi \| Lord Raptor \| Imperiex \| Vertex \| Swarm \| Mister Mind \| Bad Rap \| SCP–049 \| Alexia Ashford \| Professor Hojo \| Darth Jadus \| Angel \| Eirin Yagokoro \| Saya, Sheath, Dokugozu and Dokumezu \| Ciseaux \| Raidriar \| Walpurgis Night \| T-A.L.O.S. \| Anti-Monitor \| Athena \| Garnac \| Technovore \| Pluton \| Mack Salmon \| Nouhime \| D'Compose \| Yami \| Court of British Underworld Shogo Makishima \| Mary Sibley \| Hagoromo Gitsune \| Otoya Takechi \| Yandere-chan \| Prince Gasket \| Princess Archerina \| Lelouch vi Britannia \| Barry the Chopper \| Audrey II \| Diaboromon \| Sachiko Shinozaki \| Alphard Alshua \| Creed Diskenth \| Pluie \| Princess Shroob \| Ghost \| Mr. Mxyzptlk \| Diagon \| Raff (Ben 10) \| Yamai Sisters \| Souichirou Kuzuki \| Caster \| Kayako Saeki \| Ludo \| Succubus Queen (Vindictus) \| Ryouko Kusakabe \| Emperor Dalek \| Rataxes \| Brotherhood of Anarchy Gazelle \| Gendo Ikari \| Balalaika \| Dr. Hans Reinhardt and Maximilian \| Gleeman Vox \| Blockheads \| Vincent Moore \| Dorothy Catalonia \| Gargoyle \| M.O.D.O.K. \| Esdeath \| Decoe, Bocoe, and Bokkun \| Konstantin and Ana \| Master Computer Program (MCP) \| Sark \| Takeshi Gouda and Suneo Honekawa \| Sir Isaac Ray Peram Westcott \| Ellen Mira Mathers \| B-ko Daitokuji \| Big Daddy \| Mr. Tinkles \| Mutant Leader \| Rufus Shinra \| Hugo P. Vasquez \| Satyajit Shyamalan \| Speckles \| Selvaria Bles \| Arthur \| Professor Mystery \| Ace Hardlight \| Neutral True Assassin \| Atman \| Moon \| UBOA \| Morpheus \| The Groke \| Fallen/Destroyed Groups and Alliances The Inferno Clan of Hell Zabuza Momochi \| Nergal Jr. \| Ashleigh Crichton \| Adolf Hitler \| Wilhelm Burgdorf \| Hans Krebs \| Joseph Goebbels \| Otto Gunsche \| Alfred Jodl \| Delilah Barnsley \| Mephistomon \| Klaus Adler \| Izaya's Syndicate Namie Yagiri \| Mairu and Kururi \| Master Hand and Crazy Hand \| Grapefruit \| Big Bad Wolf \| Chemo \| Big Chill \| Vladikoff \| Malware \| Zzzax \| The Nega-Acolytes TBA Hirudegarn's League TBA The Mystery Club TBA Duskmon's Alliance TBA King Henry's Forces TBA