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Theodore has a formal, old-timey feel, so boys names that come to mind are:

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Archibald "Archie"
Maximilian "Maxim"
Arnold
Robert - a bit more modernly viable
Eugene - one of my favourites
Christopher -really respectable if not shortened to Chris
Alfred - Tennyson's name, so also respectable

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Of your choices, I like Simon. I think it goes nicely.

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For girls, you could pick a short, pretty, old-fashioned name: Martha, Lisa.... Wendy? (just throwing it out there)

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Or something like Jessica, with its stately sound and Shakespeare connections (if you can get past the 90s popularity)