Original Ben 10 aliens: Starlequin and Fragon by MisakaLovesYou on

Fragon Design Notes (Ben 10 OC Alien) by MisakaLovesYou on DeviantArt

Spyro2108 - Student, DeviantArt

You know it's just occurred to me that the original series had up to 19 aliens in the roster, but if you added Feedback from Omniverse that's an even 20 : r/Ben10

MisakaLovesYou - Hobbyist, General Artist, DeviantArt

Which alien from the original series is your least favorite? : r/Ben10

Ben 10 Ultimate Alien: original alien design by r1tard on DeviantArt

Ben 10 Crossover Alien Fusion : Mecha-Quill by Metalsonicomaewa on DeviantArt

BEN 10 Classic facts about original 10 aliens

Ben 10 hero time. Alien X by mineSonic06 on DeviantArt

Ausitn's classic Aliens Part 2 by MrRyder on DeviantArt

MHA Rise of Ben 10: Ultimate Humungousaur by MisakaLovesYou on DeviantArt

My Ben 10 Starter Aliens by DragonKing3721 on DeviantArt