monomaniacal (adjective)

1. She is monomaniacal about cinema and spends every weekend watching movies from different eras and genres.

2. He is completely monomaniacal about anime and can spend hours discussing different anime series and their characters.

3. My friend is monomaniacal when it comes to jokes; he always has a new joke to share no matter the situation.

4. The artist's monomaniacal focus on abstract art is evident in the amazing collection of abstract paintings in the gallery.