He has become a figure recently, mainly through his role in Smash Bros, but did not exist at the time Game & Watch was made, and was not used on the boxes and advertising etc. So in my view he does not really count as a mascotte.
The Famicom Disk System (ファミリーコンピュータ ディスクシステム) is the only Nintendo console / peripheral that has it's own mascotte: Diskun (ディスくん).
Just spotted a bunch of (rare) Diskun merchandise on Yahoo Auctions, including a hand bag, coasters and bento boxes. Hyoi!
Some more work done on the Nintendo beforemario collection today. Added lights to most cabinets now.
Small tweaks to contents of displays next, then on to playing cards section.
How do you like the result so far?