Silliest lil ship idea:
Foolish/ Agent 18 / Fred / Tubbo
The worst polycule you’ve ever seen in your life, cuz 2 of them constantly want to make the other 2 people’s life hell. And it constantly changes.
OH THAT WOULD BE THE WORSTTT
I think Agent 18 can't stand how sweet their boss thinks Tubbo is, so he sets on a quest to show Fred just how awful Tubbo is, and ropes Foolish into his idea bc surely Foolish will get where he's coming from. (Cough cough it's not an excuse to spend time with Foolish wdym)
So they're plotting and because it's Foolish this is of course going to be a homoerotic enemies thing. Interrogating Tubbo into admitting to some sort of horrible crime and they get all up in each other's faces, while Agent 18 and Fred watch behind a one-way mirror.
Agent 18 has told Fred that this is because he needs someone to record this, and Fred is a regular report writer. Fred is nervous bc oh god it's Tubbo, he's going to dig himself into a pit so deep he can't possibly crawl out, right?
Nah. Tubbo can occasionally have a silver tongue, especially when he's not aware his crush is around.
Foolish and Tubbo are all up in each other's faces. Tubbo doesn't even seem intimidated when Foolish pulls his gun. Agent 18 isn't getting what he wanted at all, but then Foolish and Tubbo break the tension and finally kiss, and he realizes oh god. He doesn't know which one of them he's jealous of.
Anyway etc etc, Fred has also found this exchange hot and talks to Tubbo about it and Tubbos like HAHA SUCK IT AGENT 18 bc his plan completely fucking failed. And Fred's like we should play wingman for them and Tubbo's like UGH FINE.
Somehow this ends up in one of 18 and Tubbo's signature homoerotic enemy moments and they kiss and Foolish is like goddamn ok. Like he's into it. And somehow THAT is what gets Foolish to be into Agent 18.
Anyway a lot of flirting later, they become the world's worst polycule. Like Fool18 and Frubbo are okayish on their own but all together they are constantly trying to murder each other in increasingly bizarre and homosexual ways. And I think that's beautiful.