I thought Jackie had one of the coolest TF mouths ever-- those lip cracks are totally different from what I've seen so far in Prime. They definitely made it more interesting when Jackie talked, I don't know why! :C
Maybe he'll get hit really badly with something, so that his processor reverts to being that of a bungling scientist. I hope it does happen, that would be so amazing. One moment he's something of a samurai, and after a nasty fight, BOOM-- lab explosions and SCIENCE.