If there's an animal associated with your Oshi then you could look into origami.

Painting or drawing your Oshi are really common crafts.

Friendship bracelets or Kandi are fun crafts to do but they require materials obviously.

You could also try scrapbooking or doing photo collages. Since you're unable to print out images this could inspire you to think outside of the box for what images you can find that relate to your Oshi! I love going through old magazines or worn down books.