8. Mako Mori - Pacific Rim
Ask just about anybody who their favourite Pacific Rim character is and, well, it won't be protagonist Raleigh Becket (Charlie Hunnam), but either Stacker Pentecost (Idris Elba) or most likely Raleigh's co-pilot Mako Mori (Rinko Kikuchi).
Mako was a tremendously likeable character and, in the eyes of many, should've been Pacific Rim's protagonist in place of her more generic colleague.
It seemed like a foregone conclusion when Charlie Hunnam wasn't available for the sequel, Pacific Rim Uprising, that Mako would be promoted to protagonist, yet Mako was ultimately relegated to a non-event supporting cameo, behind new hero Jake Pentecost (John Boyega).
To make matters worse, Mako's role ended with her being suddenly killed in a helicopter accident by a rogue Jaeger - a decision which pissed off just about every single fan of the original movie.
It made no sense at all, and honestly, it would've been better if Mako was simply kept out of the movie entirely if this was all they had planned for her.
A sequel with Mako as the lead would've certainly been better than the forgettable slop we ended up with.