This reminds me of when jQuery had a cartoon ninja on their homepage. Am I seriously looking at a page targeted at grown adults with a talking butterfly on it?
2. Liking Go != liking the mascot
3. I think most would agree this is ridiculous: https://www.googlemerchandisestore.com/Google+Redesign/Brand...
FWIW, Russ Cox's GitHub icon[1] is similarly scary to me.
I think the plain TM might help you if it is published on paper (like in some well-known dated publication) and you are later fighting someone else for the registered trademark, but it might be only slightly better than no help whatsoever.