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    Undertale LORAs for SDXL/Flux

    I've noticed a lack of Undertale LORAs for SDXL, so I've trained one on Animagine XL v3.x. It can work on some other models as well. I also trained a PonyXL and Base model version s and right now Flux LoRA in process.

    Training Data for SDXL:

    • Used around 800 images in total, with some later additions

    • Can influence style quite significantly (mostly 3.0 models)

    Flux LoRA:

    • Currently being trained using split mode and fp8 version of dev model

    • Quality uncertain at this time

    • Uses smaller dataset of 558 images and less repeats, Florence2/JoyCaption captioning + corrections by me

    • Possibly would retrain at some point

    Characters: Asriel, Chara, Frisk, Muffet, Sans, Papyrus, Undyne, Gaster, Toriel, Mettaton, Grillby, Alphys, Flowey, Asgore, Napstablook

    Note: Quality varies between characters. In version 1.0 of Animagine, avoid generating Asgore or Napstablook due to overfitting. Version 1.1 and onwards work better, but caution is still advised.

    Parameters:

    • Trigger words: character_(undertale)

      • Some characters work well with trigger words alone

      • Others require additional prompting

    • Flux: Natural language prompting

    • SDXL: Booru tagging

    • The _(undertale) part isn't strictly necessary

    Model-Specific Notes:

    1. Flux:

      • Use guidance of 3.5 or higher for better character likeness

      • Higher guidance may increase stylistic differences between images

    2. Animagine 3.1:

      • Model 1.2 surpasses previous versions in flexibility and capabilities

      • Stylistic differences between versions are subjective

      • Personal preference: Model 1.2.5 for style, but has biases due to initial overfitting

    3. Base XL:

      • Second model trained on base model for broader compatibility, as a substitute when other models don't work

      • Intended for use with any model, but struggles with anime models

      • Examples not limited to Animagine v3

      • Currently not fully accurate, performance varies by model

    4. PonyXL:

      • Trained on civitai

      • Can produce good outputs

      • Missed some character features

    Note: There may be stylistic inconsistencies, so it's better to specify your preferences when generating images.

    Description

    Trained anew through civitai. Seems to have less issues that have to do with fp8 training and is easier to prompt. But the style of generations seems to be quite different from before. In some cases, previous versions could be preferable.

    Some characters can be harder to generate (Undyne in particular) than before, while others are easier.

    FAQ

    Comments (2)

    stygianwizard42Jun 12, 2025
    CivitAI

    will you do a deltarune update?

    munchkin
    Author
    Jun 12, 2025

    Perhaps if I have to do some Flux stuff with it, though it would require me to filter and recaption a lot of images, would take a lot of time. Otherwise it should work on practically all SDXL models in a good enough state (especially Illustrious one).

    Although Illustrious has newer base models, so I'll see about that. Maybe NoobAI too.


    Edit: If you meant new characters - I'll see about that.

    LORA
    Flux.1 D

    Details

    Downloads
    208
    Platform
    CivitAI
    Platform Status
    Available
    Created
    6/12/2025
    Updated
    4/30/2026
    Deleted
    -
    Trigger Words:
    frisk_(undertale)
    chara_(undertale)
    sans_(undertale)
    toriel_(undertale)
    asgore_(undertale)
    mettaton_(undertale)
    alphys_(undertale)
    undyne_(undertale)
    muffet_(undertale)
    grillby_(undertale)
    napstablook_(undertale)
    w.d.gaster_(undertale)
    flowey_(undertale)
    asriel_(undertale)
    papyrus_(undertale)

    Files

    undertale-flux_civitai.safetensors

    Mirrors

    Available On (1 platform)

    Same model published on other platforms. May have additional downloads or version variants.