People who start as low-key enemies/rivals and snark at each other so hard it's blatantly obvious they feel really passionate about each other and enjoy each other's company and just want to be snarky together forever. 
Awkward lawful good who is so nice, self-sacrificing and honourable they'd die before doing something selfish or ethically wrong, saved/protected from being taken advantage of by scary-seeming person (possibly reformed villain) who is actually just awkward and has no idea how to interact with people normally. 
Friendship/Bromance that just sort of... evolves into a romance because they're just so comfortable around each other and it's like... oh huh, I guess we'll move in together, huh? 
ANGRY SMOL AND GENTLE TALL! 