I do agree that Vivi is mysterious... but Shadow's most likely the most mysterious Final Fantasy character there is.

Although I do love Vivi, well, I kinda misread a poll wrong once, and said he's my favorite Final Fantasy character ever, and he isn't. Though I do love him.

Shadow by far is the best character. I believe him to be, like I said in the beginning, the most mysterious character ever.

He also throws weapons. ^^