I've known three pairs of twins:
Jonathan and
Michael (fraternal)
Laura and
Marina (fraternal)
Danielle and
Nicole (identical)
I think
Jonathan and
Michael sound just right together. The others work well enough, but if you want to get persnickety, then the only complaint I would have to make is that
Laura seems a lot more mainstream than
Marina. I don't particularly like the names
Danielle or
Nicole (I hate the name
Nicole in fact), but I like all the other names.