A few months ago a was watching an episode from the latest Dr.Who season and it suddenly occurred to me that the Dr and Ellemist have so much in common it's a little eerie.
They're both the last of their kind
Are ridiculously intelligent and clever.
Almost god-like with their technology
Always meddle in the affairs of other races when they see fit
Both have a similar rivalries Ellemist-Cryak Doctor-The master(in the old series)
I don't know if these kinds of characters are common in scifi (I only like Animorphs, Dr who and Star wars
), but I thought it was kind of interesting when I thought about it.