Anime show featuring a blue boy with arm cannon

Question

I remember a few years ago, I watched a little bit of an anime where the main character was a boy in blue with an arm cannon. I recall the talking blue arm cannon as being a wolf's head, though that might not be correct. I know it was some kind of animal head (note: cannon might also have not talked, but it was definitely an animal head).

I've been thinking about checking the shows Toonami used to air but I can't find a collection of their shows. That might be a good place to start looking.

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It's not "Space Adventure Cobra!", nor is it Mega-Man (unless there's a version of mega man that has a talking arm cannon)

Answer 1

"nor is it Mega-Man (unless there's a version of mega man that has a talking arm cannon)"

There is indeed. In Mega Man Star Force, the protagonist merges with a wolf-like entity, an "electromagnetic being" named Omega-Xis, to become this series' version of Mega Man, in the form of an "EM Wave Human". When they are merged together, Omega-Xis resides in the wolf-head-shaped gauntlet/cannon on Mega Man's arm, and frequently talks to the protagonist: