On Themis [6.4 SPOILER]

[RyuDragnier]

Between this and your above assessment of him, I think you've misunderstood Hythlodaeus's character. He's pleasant, but if you pay attention to the way he behaves, he's obviously only motivated by his intense love for specific people and is otherwise largely apathetic to what's going on around him. When he's planning to have Emet-Selch train the charybdis, he expresses no compassion for the animal or even for Hermes, only how it will be neat if Emet does it and how it'll make him happy since he always likes playing the hero in the long term. And then during the rest of the Elpis, while Emet is trying to reach out to Hermes in his unconstructive tsundere way, Hythlo still shows virtually no interest in him and just worries about Emet's feelings being hurt. He's even low-key mean a couple times.

He's also pretty clearly depressed. He constantly puts himself down and negatively compares himself to his friends, and one of this revival quotes is even "You shouldn't have. No, really."

I think he's the most interestingly characterized NPC during the Elpis arc, even more so than Hermes, because so much is unspoken.

What I love most about this? It gives some reasoning for how Hyth, Emet, and Azem became friends. Hyth feels like he can't measure up to others and doesn't want people to worry about him, but at the same time wants them to succeed and do well. Emet comes across as somebody who has been hurt before (thus his attitude), but genuinely does care about others. This leaves Azem. While not much can be said about them, due to their inability to sit still and how they explore the world, I think they have a combination of genuine curiosity for the world and a Death Seeker vibe to them. They're not just fighting to help people (though that's likely a big thing for them)...they're looking for someone or something to kill them in battle. The Ancients do seem to come across as having a Martyrdom Culture.

Meaning Emet worries about Hyth and Azem, Hyth genuinely wants Emet and Azem to be well, and Azem...wants everybody to be happy.

[Dikatis]

This leaves Azem. While not much can be said about them, due to their inability to sit still and how they explore the world, I think they have a combination of genuine curiosity for the world and a Death Seeker vibe to them. They're not just fighting to help people (though that's likely a big thing for them)...they're looking for someone or something to kill them in battle. The Ancients do seem to come across as having a Martyrdom Culture.

Meaning Emet worries about Hyth and Azem, Hyth genuinely wants Emet and Azem to be well, and Azem...wants everybody to be happy.

I don't really get how Azem would be a death seeker in any shape or form. They're the disciple of Venat, someone who inherently loves life, living, and the world itself. Calling Azem a death seeker is like calling WoL a death seeker for plunging into life-or-death situations as an adventure junkie when WoL would very clearly rather live than die (if they wanted to die they'd just call Julyan old). I guess you can headcanon anything, but I cannot agree with your interpretation that Azem, and by extension the Warrior of Light as their reincarnation, is somehow looking for someone to kill them when they have so much and so many people to live for and clearly want to live for.

You could ascribe those kinds of feeling to Zenos, but even then it's more about the euphoria of being locked in combat with an equal because he does not know how to express his feelings outside of violence because of his upbringing and the nature of Garlemald. He only kills himself at the end of Stormblood because he couldn't imagine being happier than he was in that moment and wanted to go out with a bang rather than a whimper.