Here's the members of the team : Hawk Moth's Akuma Alliance
Gabriel Agreste/Hawk Moth : (Leader)
Natalie Sancoeur/Mayura : (Co-Leader)
Tomoe Tsurugi : (3rd Leader)
Bowser, Dry Bowser, Bowser Jr, the Koopalings, the Koopa Brothers, Kamek, Kammy, Jr. Troopa, Goomba King, Wingo, Boshi, Wario, Waluigi, Broodals, Basilisx, Popple, Croco, King K. Rool, Klump, Krusha, Ganondorf, Vaati, Ridley, Kraid, Sylux, King Hippo, Medusa, Thanatos, Pandora, Eggplant Sorcerer, King Dedede, Escargoon, Lord Nightmare, Nightmare Enterprises, Dark Matter, Wolf, Leon, Panther, Black Shadow, Blood Falcon, Giovanni, Team Rocket (Jessie, James, Meowth, Cassidy, Butch, Attila, Hun, Ariana, Archer, Proton, Petrel), Team Aqua, Team Magma, Team Galactic, Team Plasma, Team Flare, Harley, Shamus, Silver (Pokémon; Ash's new rival), Team Meanies (Gangar, Medicham and Ekans), Team Skull (Skuntank, Zubat and Koffing), Medeus, Rudolf, Jedah, Nergal, Zephiel, Arvis, Julius, Ashnard, Validar, Anankos, Thales, Lyon, Porky, Saturos, Menardi, Dickson, Zanza, Rahu III, Hadron, Master Evil, Ogura, Liquid Snake, Revolver Ocelot, Bagura, Eggman, Metal Sonic, Orbot, Cubot, Decoe, Bocoe, Bokun, Scratch, Grounder, Coconuts, Zavok, Zazz, Zomom, Zeena, Master Zik, Zor, Lyric, Reala, Dark Raven, Dr. Bad-Boon, Dr. Roy Curien, Death Adder, Yakuza Nikishi, Boss Cass, Karlos, Risky Boots, Dr. Willy, Robot Masters, Vile, Gemini, Lord Betrayus, Dr. Buttocks, Butt-ler, Golvis, Spooky, Galaga Legion, Joker, Janga, Masayoshi Shido, Suguru Kamoshida, Sugimura, Cortex, Brio, Nina, Tiny, N. Gin, Dingodile, Tropy, Gnasty Gnorc, Ripto, The Sorceress, Clockwek, Raleigh, Mz. Ruby, Muggshot, General Tsao, Dr. Nefarious, Baron Praxis, Specter, Grunty, Ultratech, Wesker, Timothy, Astaroth, Firebrand, Vergil, Lord Raptor, Jedah Dohma, Grandmaster Meio, Gava, Pinky and the Brain, Roderick and Rhubella Rats, Skeletor, Hordak, Mumm-Ra, Dr. Claw, Gargamel, No Heart, Commander Cobra, Chrysalis, King Sombra, Tirek, Cozy Glow, Grogar, Megatron (G1), Megatron, Starscream, Soundwave, Shockwave, Thundercracker, Thunderblast, the Shredder, Lord Zedd, Rita Repulsa, Goldar, Scorpina, Rito, King Mondo, Queen Machina, Prince Sprocket, General Venjix, Divatox, Ryagog, Elgar, General Havoc, Darkonda, Trakeena, Prince Olympius, Frax, Retinax, Nayzor, Mandilok, Zeltrax, Mesogog, Psycho Rangers (red, blue, black, yellow and pink), Red Claw, Mojo Jojo, Vilgax, Aku, Maleficent, Pete, Beagle Boys, Merlock, Magica De Spell, Big Bad Wolf, Fat Cat, NegaDuck, Megavolt, Bushroot, the Liquidator, Quackerjack, Lord Dragaunus, Chameleon, Siege, Wraith, Duke Ighthorn, Phantom Blot, Demona, Skeleton King, Doctor Doofenshmirtz, Norm, Lil' Gideon, Emperor Belos, Lilith Clawthorne, Hawk Moth, Mayura, the Evil Queen, Magic Mirror, Stromboli, Chernabog, Headless Horseman, Lady Tremaine, Lucifer, Siamese Cats, Queen of Hearts, Captain Hook, Cruella de Vil, Horace, Gaspar, Kay, Madam Mim, Kaa, Shere Khan, Prince John, Horned King, Professor Ratigan, Ursula, Gaston, the Hyenas, Scar, Zira, Frollo, Hades (Disney), Shan Yu, Gantu, Experiment 625, Hämsterviel, Davy Jones, Oggie Boggie, Scroop, Bill Sykes, Rosco DeSoto, Dr. Facilier, Yzma, Kronk, Randall, Emperor Zurg, Hopper, Syndrome, the Lemons, King Gorneesh, Garland, Emperor Mateus, Cloud of Darkness, Golbez, Exdeath, Kefka Palazzo, Sephiroth, Ultimecia, Kuja, Jetch, Zoma, Aamon, Dhoulmagus, Mordegon, Prophet of Truth, Atriox, Pillagers, Hostile Mobs (Minecraft), M. Bison, Orochi, Shang Tsung, Goro, Rain, Tanya, Tremor, Kano, Onaga, Tri-Borg, Master Murai, Leonard Wolf, Claudia Wolf, Xion (Bloody Roar), Dural, Nightmare (Soul Calibur), Decus, Razorbeard, DJ Octavio, Dr. Coyle, Sweet Tooth, Colonel Radec, Kazuya, Heihachi, Zeus (God of War), Salem, Cinder Falls, Edgar Zomboss, Frieza, Sorbet, Tagoma, Shisami, Raditz, Nappa, Cell, Queen Nehelenia, Amazon Quartet (VesVes, CereCere, JunJun and PallaPalla), Deep Blue, Blackbeard, Gemini Saga, Orochimaru, Younger Toguro, Mr. Akashi, Mr. Iwamoto, Kinkotsuman, Iwao, Shishio Makoto, Hisoka Morow, Weevil Underwood, Rex Raptor, Bakura, Hao Asakura, Aizen, Grimmjow, Ulquiorra, Zeref, Patolli, Dio Brando, Raoh, Char Aznable, Emperor Czar Baldy Bald III, Malty "Bitch" Melromarc, Tomura, Kurogiri, Dabi, Toga, Muscular, Mustard, Magne, Spinner, Moonfish, Twice, Mr. Compress, Spat, Garuru, Zoruru, Tororo, Taruru, Reaper, Emperor Zarkon with Galra Empire, the Father (Homunculus), Muzan Kibutsuji, Twelve Blood Moon Demons, Demons (Demon Slayer), Seven Deadly Sins (Envy, Gluttony, Greed, Lust, Pride, Sloth and Wrath), Nezu, Mochida, Osamu, Saiki, Big Cheese Seymour, Chloe Bourgeois, Felix Graham de Vanilly, Lila Rossi, Montana Max, Elmyra Duff, Kevin Levin (Ben 10 (2016 series)), Mertle Edmonds, Pacifia Northwest, Sissi Delmas, Rose/Huntsgirl, Jack Spicer, Dudley Dursley (Pre Sorcerer Stone), Misogi Kumagawa (Medaka Box), Lock, Shock and Barrel (The Nightmare before Christmas) Etemon, Arukenimon, Mummymon, Reapermon, Sagittarimon, Tactimon, Blastmon, Laylamon, Dark Generals (Dorbickmon, NeoMyotismon, Zamielmon, Splashmon, Gravimon, Apollomon Whispered), King Ozai, Azula, Fire Nation, Lord Voldemort (not joined yet but confirmed as future ally), Bellatrix (in the future), Mallfoy Family (included as future allies), Dolores Umbridge (after she was fired from the Magic Ministery in the future), Heartless, Corrupt Digimon.
Other members will also appears as the story goes on or by requests