Chrono Trigger is also one of my favorite RPGs. I love how well balanced it is.
As for my favorite character to play? That would be Ayla --- she deals the most amount of damage, and if you get her up to Level 95 (I think), she gets the Bronze Fist --- which means every Critical hit she gets deals 9999 damage! In the endgame, Marle isn't too useful as a healer --- a leveled up Robo does a great job as a healer, leaving Ayla and Chrono free to wail on the opponents.
As for my favorite character, story-wise? I like Magus here --- his being the Redeemed Evil Overlord is a very interesting character arc, which is fleshed out further in the side quests and especially with the Bonus Boss on the DS version (it's available once you've beaten the game on a New Game Plus)...
Chrono is probably my least favorite character, because he never says anything, so to me he has no personality or motivations.
I never knew the "not speaking" bit was a samurai trait, but it does fit --- doesn't it mean they are completely disposable and interchangable to their master? Which, for all I know, may be exactly the point.