Variant Stats and Additional Stats

Depending on the world and the GM's personal preferences, various stats can be added or removed from the Standard Stats.

Sparks, aka Mad Science (Res)
An attempt to represent the craziness of mad science in the game Total War: Girl Genius. Research can proceed extremely quickly, but it has the possibility of also going horribly, horribly wrong.

Either (or both) of these stats may be present in a game should the GM decide to include them. They function as a stat that can be used to do things that cannot be accomplished by normal means, and generally follow fantasy archetypes. They can also be used to substitute for other stats in proper situations (if you can write a convincing enough explanation of how it works). For instance, if you need more Espionage for a specific mission than you currently have, let your mages make your spies invisible. Note that this will usually be less effective than using the actual appropriate stat.

Examples of Usage: Teleport some forces behind enemy lines in order to catch them in a pincer maneuver. Try to summon a storm and send it at your opponents lands.

Navy and Defenses may be used as sub-stats or as additional stats to Military. The use of this is usually to specify where your military assets are divided. For instance, it makes little sense for someone who has been producing tanks for the last 5 turns to suddenly be capable of fighting a large naval engagement. Navy is generally used for sea-based or possibly air-based combat, while Defenses are used for relatively stationary pieces of equipment. Defenses cannot be used offensively, but are generally stronger than conventional military stat points in combat around their location.

Reputation is a common variation on the World Opinion Stat, which replaces it entirely. As opposed to showing how liked/disliked a faction is, the reputation of a faction shows how loved/feared the faction is. Unlike World Opinion, Reputation can be negative. Should the Reputation stat by positive it means the faction is loved by most of the people in the game (NPCs and the citizens of player nations). If the Reputation stat is negative, it means they are feared by NPCs and the citizens of player nations. This allows nations perceived as "evil" by the world to still have a ability to strongly influence other powers using fear and threats.

Examples of Usage:
Positive Reputation: Attempting to influence the NPC nations to ally with me.
Negative Reputation: Inspiring fear in the enemy army to decrease their effectiveness. Bullying a weaker NPC into joining your nation.

Possibly an additional stat to Reputation, but can be used as a replacement. This removes the sign of the Reputation stat, and simply represents how far you can convince other factions to go in doing things for you. Whether this is fear, love, economic ties, or simply being extremely charismatic, it all falls under this stat.