A few changes and additions I have for the Kingsman Universe:
I am going to extend the timeline of The Golden Circle film. Where now Poppy has girlbossed too close to the sun/one of her lackies slips up, so she has a Kingsman agent sniffing around, and, not knowing if the information had been passed on yet, she does the safe thing and takes out the entire organization. Merlin and Eggsy do not have the intel, and so they spend at least a few months at Statesman.
Agent Absinthe (my Chris Motionless OC) is basically just Chris but a spy was/is the front man of a popular metal band, recruited as part of an outreach initiative to have more "flavors" of agents, aka people who could blend into different types of crowds. He still performs and, while his bandmates are confused by his schedule/their crazy tour schedule dictated by their "manager" i.e. Champagne, it's oddly working so they just kind of go with it.
Absinthe and Vermouth (my s/i OC) have a kid. A little girl name Madeline. Since they have some trust issues because of their work, they actually bring her to Statesman with them when they have to be there. Normally, a pre-school age girl wouldn't be allowed in a top secret facility, but the other agents love her, and Champ, who considers himself a surrogate grandpa to her, always jokes that she's just training to take over someday, "Gotta start 'em young." and all that. He's even picked out her code name, so everyone at Statesman calls her "Brandy". The last agent Brandy died so they needed to fill the "role" but really it's to keep her safe.