I created a crossword puzzle. Spent a long time on it. Anyway, can't use trademarked names... But I am confused.
The theme of my puzzle is comic book characters.
Incredible Hulk. Spiderman, Wolverine. Batman.
Are these trademarked and therefore no good? I have seen these used in puzzles before.
I am confused. I understand how ADVIL or LISTERINE is a trademarked name... but I don't quite understand if comic book character names are as well.
Any help would be great.

