Mr. Game & Watch is a mascot who represents the generic player characters in the Game & Watch devices from the '80s. His animations are very limited, and his moves reference games from these handhelds.
Nintendo recently dropped the final trailer for the film, which is filled with quick visual gags and nods to the source material. There aren't too many actual reveals in this footage, as it covers a lot of the same ground as previous trailers. However, it does show that fan favorite Lumalee is returning as a prison guard of some sort, reversing the storyline from the original film in which the cheerfully nihilistic creature was trapped in a cage.
In today's first trailer for next year's The Super Mario Galaxy Movie, there's one aspect that stuck out as very peculiar. Throughout the two minutes of footage, the titular star speaks only two words (unless you count a "Wahoo!"), and they're incredibly out of character for the mustachioed good guy. "It's trash," sneers Chris Pratt voicing Mario, looking at Bowser's painting while sanctimoniously closing his eyes in the least Mario-like moment I've ever seen.