one dataset · paper, tables, graph, wiki
simgrammar the grammar of simulation

definition

A generator samples a character record from tables and rules: name from culture-specific lists or grammars, age, appearance parameters, traits under compatibility constraints, skills, and backstory fragments that modify the other fields. RimWorld gives every pawn a childhood backstory and, if generated at 20 or older, an adulthood backstory; each adds flat skill bonuses, disables or enables work types, and grants or forbids traits, and 25% of regular pawns and all faction leaders first try a fixed player-made bio before falling back to shuffled ones. Dwarf Fortress generates personalities, preferences, and appearance; The Sims and Crusader Kings generate townies and courtiers. Inputs: faction or culture, role requirements, random seed. Outputs: a character record consumed by needs, skills, and social systems.

player experience

Each new arrival is a small unwrapping. Players read the backstory and traits, decide whether to recruit, and form a picture of the person that makes later events personal. Rerolling starting characters is itself a common ritual.

design levers

  • number of trait, skill, and backstory fragments, and their compatibility constraints
  • how strongly backstory fragments change mechanics such as skills and disabled work
  • share of fixed, hand-written or community-written characters versus fully generated ones
  • name and appearance generators per culture
  • player rerolls and edits at game start

failure modes

  • Small fragment pools repeat, and players recognize the same backstories across runs.
  • Incompatible combinations produce incoherent characters, such as a pacifist whose backstory is soldier.
  • Mechanically weak characters feel like dead weight, which drives heavy rerolling.

dynamics

  • Disabled work types and traits force colony role planning around the people who arrive.
  • Generated quirks seed conflicts once relationships and mood systems act on them.
  • Community-submitted fixed characters appear across many players' games, creating shared recognizable figures.

open questions

  • Can language models generate backstories that stay consistent with the mechanical traits and skills they imply?
  • How many independent fragments are needed before players stop recognizing repeats?

appears in

the paper, 3 sections · 1 chapter · 1 episode
paper

4. A grammar of simulation games

linked in this section of the paper

paper
paper

5. The structure of the design space

linked in this section of the paper

paper
paper

8. Where the techniques land

linked in this section of the paper

paper
glossary

Glossary of mechanics

listed under world generation, with its summary

book
ch 8

Chapter 8. Where AI lands

linked from the text

book
ep 2

Where the parts came from

on screen at 3:56 the founding games

episode

sources

1
RimWorld Wiki contributors (2026). Backstories. RimWorld Wiki

provenance

runs in log/runs
2026-10-24
created2026-10-24-taxonomy-m7taxonomy