It's the characters. Either that or some of us still fantasize about Ayla bathing in a marsh with a Megasaurus... UH YEAHANYWAYS... Characters, yes. Now, Final Fantasy characters have personalities, sure, especially in the new stuff. But the diversity with Chrono Trigger takes liberties RPG's generally shouldn't.
On the other hand, it could be the people who made it. They seemed to understand before the game was even finished that, as the old rhyme goes:
"If you took all the lumberjacks in the world and made them into one,
What a great lumberjack he would be!
If you took all the axes in the world and made them into one,
What a great axe it would be!
If you took all the trees in the world and made them into one,
What a great tree it would be!
If you took all the oceans in the world and made them into one,
What a great ocean it would be!
And if the great lumberjack took the great axe, and chopped down the great tree, and it fell in the great ocean,
What a great SPLASH-SPLASH it would be!"
This being why they called the group the dream team.