Yup, just noticed some cool details on the miis when you pick them up in the "Check on the Party" menu at the inn.
Cool miis will be in a thinking pose when you pick them up.
Cautious miis will be crossing their arms.
Stubborn miis will be in a fetal position and dangling in the air
Kind miis will have both their hands on the right side of their cheek while looking up at the arrows.
Airheaded miis will be flailing around, but slowly.
Energetic miis will be flailing around very fast. Waving their arms very fast and kicking in the air a little.
Laidback miis just let their body dangle while looking left and right.
And some more tiny details I saw in my 1 month of owning the game, that each class do have some indication as to what attacks they will use, some have different dialogue for what they will use and some are more stand out like the Elf (elf having dialogue before the skill/attack) and Pop Star. Some here that I know
For Scientist you can tell by the colour of the circle in the monitor it is quite fast (unless other miis decided to land a hand). Dark blue means the mii will be using black hole. Red means that the mii will be using Glitch. Yellow means the mii will be using Cure.exe (This is easier to catch since it last longer for some reason) Nothing special for both Volatile Formula and Unstable Formula though.
For Flowers if the miis showed an angry face while saying Grr and holding their weapon up in the air, then the mii will be using Flower Power.
For Tanks if the miis is stretching their arms while saying "Ready to fire!" then it will be using the dreaded Human Canonball (NO NOT THE POPSTAR!!)
For Mage, it is pretty telling, the magical aura surrounding them when they are casting magic, orange circle means fire base spell like Explosion, Blue means lighting type spell.
If you guys noticed anything else feel free to tell, maybe I can add it into the wiki page, I do need some advice though, since it is my first time adding stuff, I added the Elf since it already has established trivia section. I dont want to disorganise the wiki page hehe.
P.S Hopefully no dialogue difference between male and female miis, that would be something haha. Like the Snap Out of It for example.