It's not your different characters.
It's the particular dragons.
Of the unique dragons, these are the ones known so far that you cannot ride:
Alduin, Durnehvir, Paarthurnax, Sahloknir, and the Skeletal Dragon in Labrynthian.
If there are others we'll find them once DB is released for pc.
Hope that helps
no, what i meant was... my mage vampire character that has mage perks can tame a legendary dragon and ride it, while my two handed warrior wherewolf character can only tame up to a blood dragon, any higher level of dragon, and i get a dragon resist voice message. i was wondering if its perk related, or a glitch or what? i thought it would be impossible to tame odahviing because of the shout timer, but u dont have to use call dragon as he circles the throat of the world. i cant belive it works with him