If you really look at Prince Hans of the Southern Isles and Ernesto De La Cruz you can see that they have a few things in common. Spoiler alert if you haven't seen either movie
1. Both were thought to have been a good person
2. Both had a dark secret that was revealed
3.Both had something to do with murder, Hans tries to murder Anna and Elsa and Ernesto murdered Hector and tried to doom Miguel to the land of the dead
4.Both got what they deserved,Hans sent back to the Southern Isles to be punished by his brothers and Ernesto getting the crushed by another bell.