Magic Man

For Lord Boxman and Professor Venomous:

Canon supervillain power couple <3

Gay peoplrrrr

For the Doctor and the Master:

Immortal genderfluid war criminals <333

So we all know the Master has killed plenty of people, but, despite their reputation, the Doctor has killed a more than average number too. Sure they undid the whole destroying their own planet thing, but that's still something the Doctor did. Also there's apparently a novelization out there where, when they were children, the Doctor killed one of their childhood bullies but then made a deal with Death so that the Master had the memory of it and became Death's champion, which is pretty messed up and murder husbandish. There are plenty more war crimes on the Doctor's hands, and the Master has killed countless people in a variety of creative ways. Also, I'm having trouble finding the quote, but I swear the Master once said something to the lines of "trying to kill the Doctor is just my flirting" or something similar. But I do know Missy (also the Master but female at the time) described their relationship as "older than your civilization and infinitely more complex". They love each other, they're constantly trying to destroy each other, they are the only friends they each have who can even begin to understand everything they've been through; they've known each other since childhood and they've watched (and helped) civilizations rise and fall together. They may not be who you first think of for murder spouses but they really are a beautiful example.

For Heavy and Medic:

Unhinged mercenaries waging unending war