fetishistic

Some of the most committed bibliophiles maintain an almost fetishistic devotion to the physical book.

OK, I know I am a little bit fetishistic. I wouldn't take it seriously if it is told by friends or families.

In Japan the fetishistic love for two-dimensional characters is enough of a phenomenon to have earned its own slang word, MOE, homonymous with the Japanese words for "burning" or "budding."