Can I use a TV character as a minor character in a youtube series?

It's basically fanfiction, just voice acted with Littlest Pet Shop toys. The character is just a small part, and they might not even "show up" (just be mentioned). Also, if using the exact character isn't fair use, can I just make a bogus name switch? If I added other elements of the TV show, because they're being acted out by tiny plastic animals, could I exaggerate it and have that count as parody? (The show is Psych, which is already comedic, so I don't know if that would slide.) Should I just drop the character entirely? It's just toys, so it's not exactly important, but I really would like use to entire plot if I could. Thank you for paying attention to this slightly ridiculous question.