Super Kuma-san

スーパークマさん, Mr. Super Bear

"Kuma is a typical friendly sentient stuffed bear -- that is, until he gets angry and transforms into Super Kuma-san, protector of all that is good and pure! With a homicidal doll on the loose, Kuma-san is up to his paws in trouble. Can he stop the carved beauty before it's too late?" - anime-planet.com