Maybe something like a picture bride brought over from another country. She thinks she may have an easy life with this wealthy husband. It could actually be more slice of life like.
Perhaps something unconventional. Maybe magical? Older husband, possibly blind, seems rich and innocent and all, and secretly bad or something.
I'm not sure exactly, but I would like to do something not normally seen in arranged marriage roleplays.
If you're up for anything, how about MxM and a 'wing it' theme? Literally just start typing and see what happens. In past experiences, the majority of ones that have no idea behind them end up being fun. ^.^
demon/angel x human
soldier x girlfriend/ex
Knight x witch/sorceress (CRAVING)
split personalities
insane asylum
Kinda feel like playing a 'crazy' guy with not so crazy moments. ^.^