Which character's death would "improve" their respective show and in what way(s)? For example: in *Enterprise*, Malcolm Reed is killed during the events of "Terra Prime", allowing the tactical officer role to be filled by Shran in the next season. 

Reed's story arc involving his former role with Section 31 would come to a decisive end as well as a reminder that a career in Starfleet is fraught with danger and risk. Ultimately, we would have a fan favourite as a permanent member of the bridge crew.