| Ben 10 Characters
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| Main Characters
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| Ben Tennyson | Gwen Tennyson | Kevin Levin | Max Tennyson | Rook Blonko
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| Supporting Characters
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| Julie Yamamoto | Plumbers (Manny Armstrong, Helen Wheels, Alan Albright, Cooper Daniels, Tack, Magister Pyke, Magister Korwak, Magister Hulka, Joel Tennyson, Gordon Tennyson, Betty Jean Tennyson, Wes Green, Blukic, Driba, Magister Patelliday, Sheriff Wat-Senn, Molly Gunther, Plumber Jerry, Magister Arnux) | Jimmy Jones | The Galvan (Azmuth, Retaliator, Galvan Teacher) | Professor Paradox | Ship | Eunice | Zed
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| Other Allies
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| Petrosapiens (Tetrax Shard, Sugilite) | Gluto | Galactic Enforcers (Ultimos, Synaptak, Tini) | The Highbreed (Reinrassic III) | Myaxx | Xylene | Colonel Rozum | SACT (Lieutenant Steel) | Ignatius | Technorg | Hector | Elsgood | Sheriff Mason | Kai Green | Ishiyama | Tennyson Family (Carl Tennyson, Sandra Tennyson, Frank Tennyson, Lili Tennyson, Verdona Tennyson, Camille Mann, Kenneth Tennyson) | Levin Family (Mrs. Levin, Harvey Hackett) | Rook Family (Rook Da, Rook Bralla, Rook Shar, Rook Shim, Rook Shi, Rook's Brother) | Ester | Gourmands (Private Brown Bag, Queen Voratia Rumbletum, Sergeant Cast Iron, Sergeant Cookmeister) | Lewodans (Tiffin, Sicily) | Rad Dudesman
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| Former Allies
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| Albedo | Elena Validus | Phil | Forever Knights (Squire, Connor, Sir Cyrus, Patrick, Sir Driscoll) | Vilgax | Michael Morningstar | Sunny | Antonio | Cash Murray | J.T. | Oliver Thompson | Zaw-Veenull | Probity
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| Deceased Supporting Characters and Allies
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| Devin Levin | Magister Labrid | Magister Prior Gilhil |Pierce | Sir George | Winston | Victor Validus | Kwarrel | The Sentinel |
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| Prisoners of Aggregor
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| Bivalvan | Galapagus | P'andor | Andreas | Ra'ad
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| Frienemies
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| Hope | Hope's Stone Creatures | Argit | Baz-El | Simian | Vreedle Brothers (Octagon Vreedle, Rhomboid Vreedle) | Blarney T. Hokestar | Raff | Serena | Bellicus | Mr. Baumann | Pakmar | Mazuma
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| Generator Rex Heroes
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| Rex Salazar | Bobo Haha | Agent Six | Rebecca Holiday | White Knight | Caesar Salazar
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| Future & Alternate Heroes
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| Ben 10,000 (Ultimate Alien) | Ben's Team (Alternate Timeline) (Ben 10,000 (Alternate Timeline), Gwendolyn Tennyson (Alternate Timeline), Ken 10, Devlin Levin, Max Tennyson (Alternate Timeline), Kenny's Stone Pet) | Ben's Team (Dimension 23) (Ben 23 | Tetrax Shard (Dimension 23) | Sevenseven (Dimension 23) | Azmuth (Dimension 23)) | Ben Tennyson (RAT Timeline) | Gwen Tennyson (RAT Timeline) | Max Tennyson (RAT Timeline) | Plumbers (RAT Timeline) (Principal White, Mrs. Dalton, Mr. Hawkins, Fire Chief Whittington, Constantine Jacobs, Mr. Enguells, Mr. Jenyx, Mrs. Carlay) | Ben Tennyson (Cosmic Destruction Timeline) | Ben Tennyson (Gwen 10 Timeline) | Gwen 10 | Max 10 | Ben Tennyson (PoE Timeline) | Gwen Tennyson (PoE Timeline) | Max Tennyson (PoE Timeline)
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