Free. No limits.
Design your own Undertale OC in seconds. Make a brand-new Underground monster or human in that quirky retro pixel and cartoon style, free and unlimited.
Describe your Undertale OC once. After that it is the same character every time.
A rooftop at night, a classroom, outer space. They still look like themselves.
Happy, angry, sleepy, shy. The same character, every mood.
Where they are from, who they lost, what they want. A story about your Undertale OC, not someone who just looks like them.
Tap an outfit and they put it on. Same face, same hair, same character.
Post your Undertale OC. Other people can draw them too and send them back. Or keep them to yourself.
Real fans filling the Underground with skeletons, monsters, and original souls every day.
An OC (original character) in Undertale is your own character set in the world of Undertale, the indie game by Toby Fox. It can be a brand-new Underground monster or a fallen human, with its own soul trait, look, personality, and backstory, drawn in that quirky retro pixel and cartoon style. GenTube builds yours from a text prompt in about two seconds.
Four steps. One: describe your character — monster or human, body shape, colors, outfit. Two: pick their soul trait — determination, patience, bravery, integrity, perseverance, kindness, or justice — and let their personality follow it. Three: set the style and setting — retro pixel or simple cartoon, in the Ruins, Snowdin, or Hotland. Four: hit create, then remix the result until it feels right. Each generation takes about two seconds, so you can iterate fast.
Both. Make Sans, Papyrus, Frisk, Chara, Toriel, Undyne, Alphys, Asgore, or Flowey, or invent a fully original monster of your own. Mix and match looks until your OC feels right at home in the Underground.
Just say it in your prompt. Add words like retro pixel art, simple cartoon, indie game style, or undertale aesthetic, and the maker leans into that charming low-fi indie charm. Try a few prompts and remix the one you like best.
In Undertale, every human soul has a color and a trait: red for determination, cyan for patience, orange for bravery, blue for integrity, purple for perseverance, green for kindness, and yellow for justice. Monster souls are white and upside-down. Pick the trait first — it shapes your OC's personality, and you can even show a glowing soul of that color in the prompt.
The setting shapes the whole design. The Ruins suit quiet, gentle characters like Toriel; Snowdin fits fluffy, bundled-up monsters and pun-loving skeletons; Waterfall breeds glowing, mysterious types; and Hotland calls for heat-proof monsters near the Core. Name the region in your prompt and generate your OC in that backdrop — then remix them into the others.
The best ones feel like they belong in the game: a clear monster type, a fun soul color or trait, and a bit of personality. Give your OC a name and a quirk, like a pun-loving skeleton or a shy ghost, and lean into that retro pixel charm.
Yes. Make as many Undertale OCs as you want, totally free, with roughly two-second generations — no credits, watermarks, or limits. Generate, tweak, and try again as many times as you like.
Yes. Post your OC to the GenTube feed, and anyone can remix it into new poses, scenes, or styles. You can remix other fans' Undertale creations too, so the whole Underground keeps growing.
Want any character, any world? Open the AI character generator — the same OC maker behind every page here.
Every Undertale OC starts with a soul — pick a trait like determination, bravery, or kindness, and decide if yours is an Underground monster or a fallen human. Fans here recreate Sans, Papyrus, Toriel, Frisk, Undyne, and Flowey, then go further and dream up skeletons, ghosts, and brand-new monster types of their own in that charming retro pixel and simple cartoon look. Set your scene in the Ruins, the snowy streets of Snowdin, or the lava glow of Hotland, hit create, and remix until it feels right at home. Free Undertale OC maker, no limits.
