I have thought of a new 6th gauge called “Strategy Points”, after Energy, Nerve, Happiness, Life and Chain. It will take form of a super pale yellow color with a lightbulb as its symbol.
You have an upper limit of 100 Strategy Points at first, but like in fighting games you can have a maximum of 300 Strategy Points, for each 100 points you get a Strategy Level.
You can hold 2 Strategies, and you can switch 2 times per day.
Any time possible (in fights, heck even in non-fighting times), you can spend any multiples of 100 Strategy Points to use your Strategy. The more SP you spend, the more effective the Strategy becomes.
For Combat Strategies, when you engage in fights, you gain SP, the more damage you deal the more you get for each hit, while being hit gains you even more SP than each time you deal damage.
For Casual Strategies, you gain 2 Strategy points each minute, and gain a set amount of additional Strategy points each time you fulfil a condition like spending energy, getting an item (from searching the city, crimes, etc.).
I was thinking of EX, but then I replaced it with Strategy to make it sound unique.