I want to talk about tempering

[ObsidianFire]

Nope. One thing all eikons have in common is that the will/desires the summoners have when they summon the eikon are a big part of the eikon's motivations. In Ga Bu's case, his frustration against his parent's murderer was what led to Titain being summoned. The very first thing Titian does is kill Ga Bu's parent's murderer.

This is why Zenos taking over Shinryuu is so shocking. The big desire Ilbred (and the rest of his followers had) when Shinryuu was summoned was anger against Garlemald. Zenos turns that on it's head.

[Eloah]

snip

You aren't wrong, per se, bit you have to remember each of these eikons has a distinct mythos that shapes the main part of their being. Think of them sorta like a SCHs faerie, and this will be a major simplification. They have their memories and core personality stored somewhere, that reforms when resummoned. But depending on the thought process when they are summoned, that will effect their actions; in a "similar" way to summoning Lily as either Eos or Selene. Again, an over simplification, but it conveys the notion.