After the GreenApple HC posts, the only ship name I can think of is Sweet Apple Sauce if the duo is paired with MC
Which now leads me to my other question (since you mentioned it be a separate list), on what your headcanons would be if MC is paired with the two lovely clown boys
HEADCANONS FOR PIERROT/HARLEQUIN/MC:
--At first, Harlequin envied MC--just thought of them as a tool or means to get back at Pierrot for never looking his way. But, the menace slowly fell for you over time---especially as MC started to see HIM for who he is, who he wants, in ways that even eluded the green clown himself. Harlequin not only learned from MC that he is worthy and capable of loving, but that he can love more than one person. You show him a side of himself he never thought possible. The doors you open will forever affect him long after you're gone--he's eternally grateful.
--Neither clown realized they could love in this way, yet they couldn't be happier. Finally, the two monsters are no longer alone---cuddling around their fragile human, and feeling complete for the first time in a long time.
--You are often the mediator between Pierrot and Harlequin. Despite their repressed feelings, old habits die hard and Harlequin often needs reminders that he must be kind/gentle to Pierrot---while Pierrot gets reminders from MC to pay some attention to Harlequin, who is often lonely and never asks DIRECTLY for cuddles (even tho he desperately wants).
--Harlequin kicks in bed, Pierrot drools on his pillow, and you snore---basically you're all menaces to whoever has the misfortune of sleeping in the tent next to you all.
--In the mornings, Pierrot wakes you and Harlequin up (as you and he like to sleep in).
--Pierrot makes a variety of dishes to please both his lovers. At MC's insistence, they make Harlequin either chop vegetables or help clean, as a way to thank Pierrot. You mainly get Harlequin to 'help' however by either promising him some sexy times or reminding him yet again that doing these small gestures show Pierrot that he's loved <3
--You and Harlequin prank the circus, though you do hold him back when it comes to TicketTaker and Pierrot especially.
--On occasion, perhaps late into the relationship, you three invite Doctor to join as a part-time fourth~ that is, until you all catch feelings for him too and vice versa.
--Harlequin is much calmer than he's ever been. Don't get me wrong, he'll always be a menace, but now instead of knives in his back he can expect loving bites~ finally....he's sated.
--Having sex with you in the mix is hot, and sensual. With you, they get to explore the ideas of 'making love' while also getting to tie you up/dominate. However, it is nice as well when Harlequin/Pierrot have sex just themselves as they are less delicate and can bite much harder. You like to watch~
--Because you are there, the circus takes a few more 'vacations'. This is Jester's way of showing Pierrot and Harlequin that he understands that they only have a finite amount of time with you. So, going on these trips is his way of honoring your relationship, even if he'd never say so out loud.