I find it interesting that all the Primals have different habits of Tempering.

Ifrit is the one who seems to most desires worshipers, tempering left and right and creating some of the most zealous Tempered.

I haven't seen any that have been tempered by Garuda other than the Ixal who summoned her, however she does try to temper the player when she first fights them. So I'm guessing she prefers to temper those who have proven themselves to be strong to act as her Champions. Also she seems to prefer devouring aether to worship.

As for Titan, the Kobolds don't actually seem that extremely tempered as other Primal worshipers, at least when talking to the beastmen daily Kobolds. Although I've only played through the first bit of those quests so if someone can clarify how extremist the Kobolds get.