Ryuutakeshi
Smash Lord
Robin x Lucina is also super sweet.It's an amazing support. They literally get together because they both love Chrom so much.
Though I never understood why so many people like to ship Male Robin with Lucina. As cool as she is, I don't share that headcanon. In my playthrough, Lucina married Yarne. While my Robin married Nowi.Manakete Morgan is freaking awesome.
I've seen some criticisms regarding Cordelia x Frederick on the grounds that it feels like she's just settling and wouldn't be very happy. Not something I believe myself but I've seen it around.