Of all the ff 12 characters, I liked Vaan least of all.
EDIT:
Cyan is anything but silent, if anything he talks too much, always sticking his nose in things to try and correct morals, he was kind of like a counselor. Locke really has some moments where he is quite deep, but on terra you are right on the mark if you consider the cloud immediatly after Aerith leaves the party for the last time