Okay. Question 1. I'm going to assume the artworks portion might be commissioned artworks that the creator of the character paid for, which is fine from our standpoint. The slightly dodgy bit comes with the writers using the character. I would actually have to see what's been done as far as other works using the character, but it might very well become a fanwork. Certainly we treat webcomic fictions as fanworks.
Feel free to link me, and I'll look.
Question 2 is easier. If you mention a widely known pop culture reference, that doesn't need to be disclaimed or cited in an original work. The resemblance portion of the disclaimer does cover that, along with the acknowledgement that the story is fictional. Otherwise, no one could ever go to McDonald's or have a Starbucks, and fiction would cease to exist as we know it.