underrated olivine trait is that he's actually incredibly cagey. spent his entire life learning to lie and keep secrets. we don't realize it because he's so desperate for eiden to hear him out and validate him, but then you get events like chimes of darkness or blood key, or hell, the scene in idol fest where he sneaks off alone to read his parents' letter. this bitch got secrets! he's only this open with eiden because he trusts eiden down to the marrow.