My Ideas;;
1) King of the Hill
Have one flag centered on the map and have it be like one flag.
But add some Roll the Dice into it and give people a random class/advantage/disadvantage. Individual players get cash to buy upgrades/ammo and such. So possibly have the classes very basic and be able to buy attachments and maybe a few mods.
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2) Mafia
Did you ever play the game where people are randomly picked to be the murderer/healer/sheriff/citizen?
On spawn, each player is given a title and there are two teams. One team is the Mafia, and the other team is the Townspeople. The mafia has less people, they have shotguns(super models maybe?), SoH, 1.5 health, and their objective is to kill the entire other team. The Townspeople include Sheriff, who has normal health, a .44 magnum FMJ,Tac Knife, and thats it. Their is also a Doctor, whose weapon is a care package marker and they can't knife. Thier Ability is 1.5 speed and they can revive fully killed teammates but they have 50% health. The third type of townsperson is the townsperson. they have no abilities besides a single throwing knife.
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3****Best One****
Name: Prototype(Could think of better name idek xD)
Sometimes, I don't always have many people online. So I think there should be a game that is fun for just 4 people and hopefully could be a good 1v1 game. Maybe do another terminator type thing but without the humans. Give everyone x5 or even x10 health with no regeneration(maybe randomize some of the settings). Spawn them with FMJ Barrets, AT4's, Thumpers (Randomize These Each Different Round). And the perks would be SoH, no middle perk(middle perk is awarded at the 5 kill mark), and commando. Have killstreaks like sentry gun for 3 ks and pred for 4. The game setting would have rounds if it were teams/1v1 but in FFA, there would be rounds and the winner would get a point for a win and its the best out of 3.
And have the game automatically set the kill limit based on the amount of health.ex. 10x health = 8 kill limit so 5x health =12 kill limit
^That idea is my fav