Traits (positive/negative)
Characters have inborn or acquired traits — some beneficial, some detrimental — that modify behavior, stats, and interactions, giving each a distinct personality and mechanical profile. RimWorld's pawns and Crusader Kings' characters are defined by trait combinations (a brawler who can't do research, a paranoid genius) that create emergent stories and management puzzles. Designers use traits to individuate characters cheaply (a few traits make each pawn feel unique), to create interesting constraints and synergies (working around a colonist's flaws), to drive emergent narrative, and to add depth to recruitment and character-building decisions. Key decisions: trait pool breadth, how strongly traits affect gameplay (flavor versus mechanically decisive), whether traits can be gained/lost/cured during play, conflicting-trait interactions, and negative-trait severity (a fun flaw versus a character-ruining one). Pitfall: traits that are purely negative with no upside make characters feel like liabilities to discard rather than personalities to work with, while all-positive traits are just stat bonuses — the richest systems mix trade-offs so each character is a distinct puzzle of strengths to leverage and weaknesses to accommodate.
- Dev effort: Medium
- Timing: Real-time or turn-based
- Common in: colony-sim, grand-strategy, rpg