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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

    More stable version than alpha, but may be a bit less accurate in some aspects.

    Differentiates between different characters better, but characters themselves may require more prompting (depends on a character). There is a certain imporvement of styles and backgrounds. It seems to have learned some other details too.

    And I am not sure if fingers are better than alpha in comparison. Since model still adds hair and other details where they aren't supposed to be, it is beta.

    FAQ

    LORA
    Flux.1 D

    Details

    Downloads
    332
    Platform
    CivitAI
    Platform Status
    Available
    Created
    9/23/2024
    Updated
    4/29/2026
    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_beta_rank64_bf16.safetensors

    Mirrors

    Other Platforms (TensorArt, SeaArt, etc.) (1 mirrors)

    Available On (1 platform)

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