So, we or most people may know. Each shape has their own job in the series... Squares are the Managers. Circles the workers. And Triangle the Soldiers. But that is literally not important in the game since all guards are circle when you play them (Or unless you use a skin.) My suggestion though... Make the skins be for 1 of 3 guards you can be when you join the Guard team. Aka 3 sub-teams in the team.
Square. = Overall balanced, no changes from OG gameplay of guard. (Costs 400$ total, 350$ to be guard and 50$ more to be a SQUARE guard, the guns shoot faster though.) Circle. = Get more money from putting people in their coffins/boxes. HOWEVER, get less money from shooting people... Can be choosen for free once you join the guard team. Triangle. = Circle, but you get more money from shooting people and less money from placing them in the boxes...
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Personally i think this would REALLY help when there are a lot of guards in the guard team cause past 3 guards, it's just not profitable anymore. You'd be losing money at that point.
And yet again, i should remark this is a SUGGESTION, you can grab the general idea and switch it up a bit, maybe using a rank up system for people who like to play guards? Or atleast make something similar.
Update>
Some people are say that Black-Skins for the guards should give 25% boost to their earnins. And goldens a 50% boost... Agreed.
@cloud night (Helper of coming up with this suggestion. Along with @half wedge , and @sacred skiff sort of [Mostly ragebaited but still helped ngl])
Update 2>
Another suggestion i heard was to keep the normal pink "Cosmetic" skins on the shop, but instead of being cosmetic skins it'd be to unlock that shape... It's bit mid but eh, if the devs want more grinding for guards-