[I think there's non-canonical books that go into the Tip/Ozma thing - like Tip being an entirely separate character (so Ozma could have a love interest!!?) - I'll locate the wiki pages later for that]
edit: much delayed locating.. http://en.wikipedia.org/wiki/Princess_Ozma#Ozma_and_Tip specifically: Grandy made the characters totally unrelated through the use of a "Switcheroo Spell", with Ozma unrelated to Tippetarius and therefore suitable as a possible love interest.
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[I think there's non-canonical books that go into the Tip/Ozma thing - like Tip being an entirely separate character (so Ozma could have a love interest!!?) - I'll locate the wiki pages later for that]
edit: much delayed locating..
http://en.wikipedia.org/wiki/Princess_Ozma#Ozma_and_Tip
specifically: Grandy made the characters totally unrelated through the use of a "Switcheroo Spell", with Ozma unrelated to Tippetarius and therefore suitable as a possible love interest.