Yes, I think
Tobias Malachi and
Rosalie Seraphina are very nice together. I definitely prefer
Tobias to
Tobiah in this case since you already have
Isaiah and
Zachariah. If I could tweak anything, I wouldn't use
Malachi paired with
Tobias since they both contain the long i sound. Are there any other OT names that you love? Also, while lovely,
Rosette doesn't come across as well balanced and sensible as
Rosalie.
BTW,
Rosalie is really growing on me. Two of my dds love this name so there's a fair chance I might end up with a gdd named
Rosalie one of these days!