How to fix Zenos one dimentional character

[Delily]

The entire purpose of Zenos is his one-dimensionality.

Every other character we have fought has some motivating factor behind them that causes them to cross our path. The Griffin wanted to force the Alliance to get involved with the war for Ala Mihgo. The Ascians wanted to restore the sundered world. The Archbishop wanted to bring law and order to the world.

Zenos serves the same function as the Joker does in the Batman series, a foil. His backstory is irrelevant. He is what he is because of what others did to him. He has no motive or concern beyond fighting the WoL. He's not really evil or good, as he doesn't care about power, wealth, or status. (He is sadistic.) He is a slow-moving force of nature. You may not like his personality, but it's crucial to his character. In his mind, he is so powerful that nothing interests him; everything is a bore.

I think Fanadiel was a mistake. Another Ascian? Who cares? We've defeated every Ascian we've come across. His shtick is that he's like Thanos, an insane nihilist. He's going to do crazy things like summon towers and primals. Big deal. Zenos just cuts everything down.

I'm also reading people say Zenos is like us? In theory, everyone is like us, a sundered soul. They made that clear. Zenos was never awakened like we were by Hydaelyn/Zodiark. A big part of Stormblood's story was they Zenos's "Echo" is artificial and that the process that granted him the Resonance drove him insane. (Fordola has the Resonance as well, but not to the degree Zenos does and she received it later). This further drives home the point that he is our counter.

The WoL travels the world helping others because we want to. Our strength comes from others.
Zenos travels the world seeking combat, his strength is all internal.

The WoL is a "friend to all", an empathetic caring person. Zenos is utterly isolated.

The WoL received his/her Echo "naturally" from Zodiak/Hydaelyn, and it has grown with us as we have traveled. Arguably it has increased our compassion to others as we glimpse parts of their story that shows us their motivation. Zenos received his power artificially and was driven insane by it.