Of course, there's

[quote=@Raineh Daze]
<Snipped quote by Earnest Evans>

Not Call Dragon, Summon Durnehviir. Because he's an immortal zombie dragon locked to the Soul Cairn, you just teleport him to your location. Shout runs out? Say his name again. 
[/quote]

Call Dragon and Summon Durnehviir are roughly equivalent, one just summons Odahviing instead. Beyond that, you can only summon it once every five minutes, Durnehviir is too big to be used indoors, he's capable of being destroyed even with swords and arrows (which implies rather negative things when you consider the sheer quantity of bigger weapons available in the multiverse), and summoning him requires a bit of a start-up that can be stopped.

Compared to Kenji's Personae, Cinder Fall'ss Dust creations, and whatever Vita wants to do with his GMPCs, it's pretty much on the same level.