My current one-year-old is, I think, the most mischievous of the three I've had so far. My husband says they were all quite similar, and that I probably just don't remember. Since I've heard that sleep is when long-term memories form, and since I'm perpetually sleep deprived, he could totally be right.
At any rate, I often describe this kid as a maniac. He's not really out of control or bouncing off the walls like I know some one-year-olds can be, he just tends to leave a wide path of destruction!
He wanders around emptying drawers and cupboards and carrying things to different rooms and throwing and climbing and tickling and hitting. He can't stay off the kitchen chairs, and he's recently learned to open the interior doors of our house (insert sad face). He keeps me constantly on my toes, or the edge of my seat, or whatever. You get the idea.
The kicker is that he does it all with such a joyful disposition that it's hard not to just sit and watch him do his thing. When he learned to walk a couple of months ago (at 14 months), I commented on Facebook what a joy and an inspiration in perseverance it is to watch someone learn to walk.
Now I get that feeling daily as I see him gain more control of his body, understand and follow commands, and take in everything around him. We have so many lessons we can learn from these short-legged (and in my case, bowl-legged) little friends.