Characters who were SUPPOSED to have a moment/scene/plotline but external forces made it impossible

Kenickie was supposed to sing Grease Lightning (Grease) but John Travolta wanted to do it so bad they gave him the song.

Lisa Lisa (Jojo’s Bizarre Adventure) was supposed to fight Kars but editorial didn’t want her to, so Kars sneaked her

Shazam (DCEU) was supposed to fight Black Adam but Dwayne Johnson rejected every single proposal for the two to fight