Yeah, I always get a little annoyed with people who say they don't like ChromxRobin simply because the supports are meaningless and silly. There's so much going on between them in the main story that the supports don't really matter.
Yeah, Male Robin and Chrom take bromance to an entirely new level....
Other awesome pair-ups:
Lon'qu and Tharja, he's scared of women, and she's really a creepy one. Not only that, you get some backstory to Lon'qu as well.
Panne and Virion, I like this also because of backstory reasons and because of Yarne. He's the only one who can pull off the grayish blue hair and it makes a lot more sense that he'd be worried about his father cheating. I mean come on, can really put it past Virion?
Lissa and Fredrick, they've known each other for a long time and this way he can get even closer to Chrom.
Male Morgan and Nah, they are just so cute together. Morgan is one of the few children characters who looks around her age, plus he's just so sweet to her. He went through a lot of trouble to please her and then tried to make sound like nothing.
Severa and Owain, she's a bully and he's a weirdo. As we've seen in Severa's supports with Noire, she gets along with weirdos (sort of). The S-support is adorable too.