He's got a dual personality - usually a quiet "nice guy" type, but when he flips, his character changes.

That you should be stalking Hanako! You'd been quiet recently so I'd let my guard down.

Being very clever and gentle, this dog is a good companion to me.

She is being quiet for the moment.

There's more to her than you think. She may seem pretty meek on first glance, but I get the sense she can get things done when she needs to.