They're all alike. Badass. Violence towards any opponents. And yes, they are plushie dolls.

Lemme do some descriptions:

Ioryogi (left) from Clamp's latest manga and anime Kobato, is a stuffed toy dog who assist the female protagonist Kobato for fulfilling her mission. Foul-mouthed, short-tempered, and always tease Kobato, although always give her a hand due to her naive.

Hyde (right) from Hyde & Closer, is a teddy bear which given life by curse magic, to protect the main protagonist Shunpei from assassinations. Most of the time he's just a normal teddy bear, but he won't show any mercy to his opponents in battles, finishing them with his ultimate weapon Texas Chainsaw. Tough, Manly, and willing to protest Shunpei, even if it will end his life.

For more information, please check http://en.wikipedia.org/wiki/Kobato and http://en.wikipedia.org/wiki/Hyde_&_Closer