Well, killing the sidekick can have a major impact on the story. You need to consider how it affects the main character's journey and the reader's emotions. Sometimes it adds depth and drama, but it can also alienate the audience if not handled well.
Sure, Hawkeye had a few sidekicks in the comics. For example, there's Kate Bishop who has been a significant partner to him in various storylines. They often work together to take on villains and solve problems.
Well, the bully sidekick in A Christmas Story is usually shown as being bossy and trying to control situations. They might also be jealous of the main character's happiness or success and try to spoil it.
Well, it could be that the sidekick prince lives again by uncovering a hidden secret or fulfilling a crucial prophecy. Maybe there's a powerful artifact involved that grants him a new lease on life.
A young and enthusiastic Pokemon researcher could be a great sidekick. They could provide Olivia with useful information about different Pokemon species and their habitats.