Firstly, The New Order are all best friends between each other. They all have different dynamics between the members but at the heart of it they are best friends.
I strongly believe that there is no such thing as "being born" in the mcsm universe which is why I have crossed out "relatives". Jack and Nurm being married makes too much sense.
I don't really write romantic relationships in a traditional sense, which is why my only pair of Lovers is Ivor x Harper and M!Jesse x Stella (because it's funny).
Isa and Maya are enemies in my lore mostly for idealogical reasons (with a sprinkle of personal reasons).
Hadrien is enemies with Soren (as the former Old Builder) for their differences in how they approach worldbuilding, but also Hadrien just dislikes the other for being weird.
Same kind of thing for Mevia and Cassie Rose, but it sounds like Cassie was a menace to everyone.
I also don't subscribe to the idea of Ellegaard and Magnus being exes or them having a love-hate relationship. I really do think they just didn't get along and that as some point something has severely soured their relationship to the point of not wanting anything to do with each other.
Isa is colleagues with Milo (rebuilding the Sky City) and a teammate to Aiden (she "hires" him to go on adventures with her).
"Best Friends Each Think Of The Other As Sidekick" is a memey kind of relationship. I can't fit it into Best Friends or Enemies, because it's neither. Healthy example of this is between Jesse and Jack (if you pick certain dialogue options). The unhealthy one is, of course, between Mevia and Hadrien.
And by far my favourite category is "Crazy situationship". Are they lovers? Worse.
I've shipped F!Jesse x Nell since Ep. 8 and while it's super fun it is also hard to see them as proper lovers. But I love imagining Jesse's aro ass dealing with her feelings for Nell who is just excited to be here.
Petra x Lukas has been a favourite since Ep. 6. Giving it a closer look revealed an incredible dynamic between these two very different people. My hyperfixation was so crazy back in 2016-2017 I started looking up pairings with a redhead girl x a blone guy just to feed myself. Because there was one single fanart for it. I am not joking, try to be a Luktra fan back then, you had to communicate with the like-minded wattpad dwellers just to have SOMETHING. Not helped when 80% of the fandom hates you for shipping their faves together that they would otherwise ship with Jesse. Absolutely crazy lore I have for these two.
Gabriel x Soren, because I have never let go off this:
Thanks to stervil for this template. This was a fun post to make.
One thing about mcsm that I will never be able to get out of my head is how Jesse attacks Nell and she just starts complimenting them. Girl has her priorities straight (or not so straight if you know what I mean).