He leans towards comic book characters too, which would be fine if literally everyone else wasn't going to be in comic costumes.
for a party, I see no problem. Go as Archie and Veronica (or Betty)
I think they're cute but a little creepy. I would say, though, unless you feel strongly about it, let him have this. It's one day a year, and no harm. If everybody else is doing it, might make the party easier.
Maybe do a comic couple that isn't mainstream right now. I'm sure there will be a plethora of joker and Harley Quinn out and about
I want to go as bacon and eggs with my husband. I don't think we'll have any parties to go to this year, so it's probably just a dream.
You could go as Beauty and the Beast, if you're willing to forgo the Disney version. You could lead him around with a leash.
I'm not completely against couples costumes but I'd rather have them be coordinating costumes, like Batman and Catwoman or Wonder Woman and Superman.
I'm definitely refusing to do Harley Quinn and Joker though! Too popular and since I know their comic relationship is horribly abusive it's too much like my past for comfort.
Raggedy Ann and Andy, Han and Leia, someone mentioned Archie and Veronica or Betty which is a neat idea, Captain America and Agent Peggy Carter, to name a few
Actually, Batman and Wonder Woman would be a canon couple too - DCAU
We just did 3 couple costumes for the AIDS Ride we do every Sept. Train engineers, Waldo & Wenda, & our own created bike related superheroes

here's a friends shot of us as Waldo & Wenda.
heard Where's Waldo and Carmen SanDiego are secretly dating for a while now.
Thanks! We were going to do Waldo & Carmen, but I couldn't find a trench on the short time frame we had.
Apparently Wenda is his girlfriend
I've always thought it was Wanda
but I know Waldo is Wally overseas, so who knows what else Wanda could be called
My parents did Cleopatra and Marc Antony once.
Maybe you should go as penguins. Even they can't always tell who's the boy and who's the girl. They mate when the boy offers the girl a nice rock. One of you could carry a nice rock.
I love all these ideas guys! Thanks!
Penguins sound a lot like humans in that description.