Yeah some were crap but some were nice ! I think it could gain a good improvement. Maybe not a stat or skill bonus as Darkraign suggested but new dialog choices or some quests or rewards acquired by this ?
Let's take once more the example of king of pearl : you sell it it makes gold, you set it free it's a treasure. Why not make this system again where you would gain a tag maybe or something on a bar meter of the personality side you're talking about (romantism, etc...) and may gain rewards depending on your meters ?
Like even a simple "Good / Evil" meter where your rewards depends on this (it can also depends on the number of points in Good or evil) and expands this to many bars in "socials" ?