I have some wants! Well, I have some 'I would likes' anyway and some speculative would likes as well.
Ishmael Croakercallmeish would love to have his brother, Mycroft, around. Mycroft is a Gryffindor and is married to Lavinia - Tiberius Ogden's sister so you get instant family!
Rufus Scrimgeourscrimshaw would love to have his brother, Diarmad, and sister-in-law, Elizabeth, around, especially now that he's going to be a father. He needs someone to ask stupid panicked questions other than his work colleagues.
Isidore Mulcibersethlans would love to have his wife, Honoria, and his son, Anselm, around. Anselm is needed for Death Eatery goodness (and friendship with other young men his age) and I daresay Dulcinea would like her mother around for helpful advice of the engagement and wedding kind.
Now on the more speculative side...
I would love to have someone to woo and court Eileen Snapenotquitebroken because it offers much fun and depending on who it is, much in the way of potential for torturing Severus. And who doesn't like that? (Sorry, Sab! :P)
I would also like to get Aberforth Dumbledorelikesgoats into more mischief beyond Order stuff and would love to have some sort of partner-in-crime for him of whatever description.