My most intense is my youngest daughter-2 1/2! Woah, holy tornadoes. Her older sister was a sweet, easy toddler, now she's a sweet, easy 5 year old, her older brother (4) is stubborn and very spirited (but very good now thanks to discipline) and SHE HAS ALWAYS been WAY more difficult than both of them put together, and started YOUNGER. Both of them started typical fits and rebellion around 18 months, she started at 9 months! She's been disciplined way longer than them, and remains difficult in some areas they put up no resistance for, but she's way ahead of the game and better than most 2 year olds-I get compliments all the time, but PHEW it has been no cake walk. She used to terrorize her brother especially. eeeeek.
She's that kid strangers look at and say, "She's your trouble maker, huh?" Even if she's just sitting there. They can see it in her eyes. She's a little outlaw. She's super upset-able, but she does control her tantrums because we don't allow that. That's what has needed most discipline, and now she doesn't do it. She "gets mad" but does not escalate into a fit if warned.