Genshin Impact and Oshi-Katsu

It seems Genshin Impact has aspects that resonate with 'Oshi-Katsu' (supporting your favorite character), particularly when it comes to prioritizing weapons, constellations, and artifacts for characters you really like or are drawn to. For me, it's Navia. I recently got her to C3 in the Trial of the Sword and gave her the signature weapon 'Verdict'. Actually, she doesn't have any other signature weapons. It was the first weapon I got from a banner. I even maxed out her skill to Crown level. I've also mostly gathered her dedicated artifacts. I wonder myself what it was that resonated so much...