Yes, it is. Coloring books are generally great for kids as they can enhance creativity and keep them engaged. The 'Bucky O Hare Graphic Novel Coloring Book' likely has interesting characters and scenes from the Bucky O Hare story that kids would enjoy coloring.
Well, obviously the Avengers themselves are the main characters affected. Captain America would be one of the most affected. Given their long - standing friendship, any shock from Bucky would deeply impact Steve Rogers. Tony Stark would also be greatly affected. Their relationship has been rocky in the past, and if Bucky does something unexpected, it would likely stir up new tensions or alliances between them.