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Xabier*

* aka @xirba13 on GitHub — makes small, sharp tools for one very specific obsession: cats. It’s mostly cats.

7 public repos · 2 followers · drawing since 2023

see the work try the live app
GitHub avatar of Xabier
the artist, allegedly

One person, one obsession

Xabier writes software the way some people keep a sketchbook: around one obsession. 4 of 7 public repositories orbit the same subject — “The Battle Cats” — and each one attacks it from a different angle: editing its saves, predicting its randomness, even digging up its history.

The toolbox is unfussy: Java, Python and TypeScript. Whatever gets the job done — a desktop save editor here, a probability calculator there, a decompilation project when the itch calls for archaeology. There is even a fork of someone else’s C codebase, bent toward a new purpose.

And the READMEs are honest in a way most portfolios aren’t: when an AI helped, it says so, by name. Claude, Gemini, ChatGPT all get credit lines here. The tools change; the shipping doesn’t.

“when an AI helped,
the README says so.”

  • Claude → portfolio
  • Claude → 2ship2harkinian-archipelago
  • Claude → battle-cats-gacha-explorer
  • Gemini → Batte-Cats-Gacha-Path-Finder
  • ChatGPT → Number-Sorting-Game

A year on paper

one year of ink — one square a day, more scratches = more commits

The projects

The stack

solid frames = languages on GitHub · dashed = things the repos quietly teach

The timeline

  1. winter 2023

    joins GitHub

    @xirba13 opens an account. The sketchbook begins.

  2. autumn 2023

    starts Number-Sorting-Game

    A game that consists in oredering numbers generated randomly. I was helped by ChatGPT. You need to have Java installed to run it.

  3. spring 2024

    starts The-Battle-Cats-Unite-Editor

    A save editor for the switch game "The Battle Cats Unite!". You need to have Java installed to run it.

  4. spring 2025

    starts nyanco

    decomp of the game and readdition of missing sprites from the original battle cats for Japanese Keitai

  5. winter 2026

    starts Batte-Cats-Gacha-Path-Finder

    Optimal roll calculator for The Battle Cats seed tracking made with Gemini's help

  6. spring 2026

    starts battle-cats-gacha-explorer

    Web app to find the most resource-efficient Battle Cats gacha pull path to the units you don't own yet, using godfat seed data. Built with the help of Claude (Anthropic).

  7. summer 2026

    forks 2ship2harkinian-archipelago

    2ship2harkinian fork compatible with Archipelago completely vibe coded with Anthropic's Claude (Fable 5)

  8. summer 2026

    starts portfolio

    A single-page portfolio generated automatically from a GitHub profile and drawn entirely in black marker on paper. Made with Anthropic Claude Fable 5

  9. summer 2026

    still drawing

    Most recent ink: a push to portfolio.

Fun facts, computed

  • 57% cats content

    4 of 7 repositories mention “cats”. This is not a phase.

  • 5 AI co-pilots credited

    README descriptions name Claude, Gemini, ChatGPT as collaborators. Radical transparency, or just good manners.

  • 5 stars, hand-earned

    Most of them shine on The-Battle-Cats-Unite-Editor. Niche tools, real users.

  • forked 3× by strangers

    Batte-Cats-Gacha-Path-Finder has been copied and carried on by other people. The best compliment on GitHub.

  • software archaeologist

    nyanco reconstructs a game originally written for Japanese flip phones. Some people restore cars.

  • 3-day longest streak

    6 active days in the last year, 41 contributions total.

* every fact above is derived automatically from public GitHub data — no hand-waving, only hand-writing.

that’s the whole sketchbook.

Say hion GitHub

No newsletter, no calendar link, no contact form pretending to be a person. Open an issue, star a repo, or fork something and make it weirder.

github.com/xirba13 bc-gacha.xirba13.com