For Theo, I would love to see some more Pureblood girls. He hasn't settled down yet, but he's really thinking about it and I'd like to see how he goes with that. Anyone who might work with him at Gringott's would be fun too.
For Harry, some more Gryffindors would be great! Also anyone else who would be in the DMLE. He has his best friends and his wife, but I'd love to see Neville, Seamus, Dean - all of those. I'd also like to see a Ginny and see how their dynamic is now, as they didn't end up a couple.
Plus we'd love anyone else you might think of! We're set in 2009 and really open character wise. Have a look here and place a hold if it takes your fancy. :)